I am new to Zotero. I have seen several University's Harvard styles. Can you add University of Manchester Harvard Style in subsequent updates?

I will provide examples for key referencing materials.

For books
In-text citation:
According to Boatright (2006, p. 27); Hirst and Thompson (1999); (Kotler et al., 2005).

Reference list entry:
Boatright, J. (2006). Ethics and the conduct of business. 5th edn. New Jersey: Pearson Prentice Hall.
Lerner, J., Hardymon, F. and Leamon, A. (2009). Venture capital and private equity: A casebook. 4th edn. Hoboken, NJ: John Wiley & Sons, Inc.

N.B. when there are four authors, list all the authors including initials. When there are five or more authors, the name of the first author should be given followed by the phrase et al.

Chapter from an edited book
In-text citation:
Lane (1996)

Reference list entry:
Lane, C. (1996). 'The social constitution of supplier relations in Britain and Germany: an institutionalist analysis', in Whitley, R. and Kristensen P.H. (eds.) The changing European firm. London: Routledge, pp. 271-304.

Conference proceedings (print)
Sandberg, E.A. (2003). 'The face of embeddedness', Proceedings of the 19th IMP conference, University of Lugano, Switzerland. 4th – 6th September 2003. Lugano: IMP Group, pp. 237-253.

Conference proceedings (online)
Sandberg, E.A. (2003). 'The face of embeddedness', Proceedings of the 19th IMP conference, University of Lugano, Switzerland. 4th – 6th September 2003. IMP Group. pp. 12-103. Available at: https://www.impgroup.org/papers.php (Accessed: 26 October 2011).

E-books
In-text citation:
Baker and Hart (2008, pp. 109 -244)

Reference list entry:
Baker, M. and Hart, S. (2008). The Marketing Book. 6th edn. Elsevier Ltd. [Online]. Available at: https://www.sciencedirect.com (Accessed: 26 October 2011).

Nota bene: When an eBook is a facsimile of the printed item with the same publication details and pagination you can reference it as a standard book.

Government/Corporate publications
in-text citation:
A recent study (Department of Health, 2009, p.24.)

Reference list entry:
Department of Health (2009). NHS inpatient and outpatient waiting times. London: The Stationery Office. London: Routledge.

Department of Health (2009). NHS inpatient and outpatient waiting times. Available at: https://www.govtoday.co.uk/health/44-public-health/552-nhs-inpatient-and-outpatient-waiting-times-figures-31st-january-2009 (Accessed: 4 December 2013). London: Routledge.

Department for Children, Schools and Families (2010). Children and Young Persons, England, The Care Planning, Placement and Case Review (England) Regulations 2010 (No.959) Available at: https://www.legislation.gov.uk/uksi/2010/959/schedule/1/made (Accessed: 10 January 2019).

Journal articles (online)
Hamblin, Y. (2005). ‘Library and information management employability skills: LIMES’, Sconul Focus, 35 (Summer / Autumn 2005), pp. 35-47. [Online]. Available at: https://www.sconul.ac.uk/publications/newsletter/35/4.rtf (Accessed: 6 May 2008).

Anderton, A. (2015). 'Displaced Music: The Ex-Concentration Camp Orchestra in Postwar Germany', Journal of Musicological Research, 34(2), pp. 141-159. Available at: doi:10.1080/01411896.2015.1020249 (Accessed: 6 May 2016).

Repository
Schlegelmilch, B. and Sinkovics, R. (1998). ‘Marketing in the information age - Can we plan for an unpredictable future?’, International Marketing Review, 15(3), pp. 162-170, Manchester eScholar Services [Online]. Available at: https://www.escholar.manchester.ac.uk/ (Accessed: 25 October 2011).

Journal (print)
In-text citation:
(Snowden and Boone, 2007, pp. 68-69).

Reference list entry:
Snowden, D.J. and Boone, M.E. (2007). ‘A leader’s framework for decision making’, Harvard Business Review, 85(11), pp. 68-76.

Newspaper articles
(Spiegel, 2011, p. 1); (Financial Times, 2011, p. 1)

Reference list entry:
Spiegel, P. (2011). Hard line taken with Greek debt holders, Financial Times, 25 October, p. 1.
Financial Times (2011). Russia’s Polymetal set for FTSE 100 listing, 25 October, p. 1.

Electronic versions
Wallace, S. (2008). ‘Barry to reject record pay deal and join Benitez’, The Independent, 6 May [Online]. Available at: https://www.independent.co.uk/sport/football/premier-league/barry-to-reject-record-pay-deal-and-join-benitez-821643.html (Accessed: 25 October 2011).

Wallace, S. (2008). ‘Barry to reject record pay deal and join Benitez’, The Independent, 6 May, Dow Jones Factiva [Online]. Available at: https://global.factiva.com (Accessed: 25 October 2011).

Reports from organization
General Medical Council (2014).Good medical practice: working with doctors working for patients. Rev edn. Manchester: General Medical Council, General Medical Council. Available at: https://www.gmc-uk.org/-/media/documents/Good_medical_practice___English_1215.pdf_51527435.pdf (Accessed; 15 November 2018).

Theses
Naude, P. (1992). Modelling organisational buying behaviour incorporating judgemental methods. PhD. Manchester Business School.
If used accessed online, please add Available at: https://global.factiva.com (Accessed: 25 October 2011).

Websites
King, P. (2011). Monday Morning QB: October 24 2011. Available at: https://sportsillustrated.cnn.com/2011/writers/peter_king/10/24/Week7/index.html?sct=nfl_wr_a1 (Accessed: 25 October 2011).

BBC News (2007). King denies criticising Treasury. Available at: https://news.bbc.co.uk/1/hi/business/7149384.stm (Accessed: 25 October 2011).

All italics follow the same style as Harvard referencing.