Heather
OPR deaths aren't indexed, - where they exist that is...........
Overall in Scotland around one third of OPRs have no death records at all, and, of those parishes which do have death records, very few have the records over the whole period of the extant OPR.
There is a Scottish NBI project but you would have to contact G&WSFHS to find out the state of play for the various Glasgow parishes.
Secondly, it's often not realised that where OPR "death" records exist many are, in fact, the record of the hiring out of the mortcloth.
In either case, don't have high hopes in terms of the genealogically useful info that such records will contain, - at best there will be a name, age, and "son of...... " or "relict of......" [relict = widow or widower]
Depending on the date concerned you might be better trying for MIs, - there are several ongoing projects in Glasgow to index the various major cemeteries, - again check with G&WSFHS, - while they aren't always the organisers of these projects, they should be able to provide contact details.
Again, depending on the exact dates, Glasgow City Council Cems and Crems may be able to help in terms of information on the sale of, and those buried in a lair.
Lastly, for much of the 1800s and well into the 1900s there was one major undertaker in Glasgow, Wylie & Lochhead, - when I went to check on contact details, I came across the following from an email from some time ago that I'd sent ............ part of which was lifted from GENUKI........
The Glasgow and Family History Room at the Mitchell Library holds the records of some twenty Glasgow cemeteries covering the period from the 18th century to the 1950's. There are a few also in the Glasgow City Archives, as well as lair plans and registers of burials in intra-mural burial grounds from 1870 to 1950. Records are arranged in chronological order and there are no indexes! A comprehensive listing, including location of registers and monumental inscriptions can be found in:- Burial Grounds of Glasgow: a brief guide for the genealogist by J Willing and J S Fairie - published by the Glasgow & West of Scotland Family History Society 2nd Revised Edition published in 1997.
Additional cemetery registers for Glasgow are kept by:- Cemeteries and Crematoria Section, Parks Department, City of Glasgow Council, 2 Port Dundas Place, GLASGOW G2 3LB (telephone 0141-333 0800)
On top of that the records of the largest funeral directors in Glasgow, Wylie & Lochhead, are held by Glasgow University Archives. See http://www.archives.gla.ac.uk/about/arcform.html
This is from an email 5 years ago from Glasgow University Archives, but I'd assume that it still applies, except that the £15/hr may have increased ! <g>
David