How to use Groups

[magicia]

I have been using Minimserver for the past three weeks, and find it works very well for searching my collection of mainly classical music and has a good interface with the Naim app. as controller. I have many albums containing seeveral works by the same composer and with the same genre. I read from the user guide that the movements for each work can be grouped together using Groups and I would like to do this. Unfortunately I have not been able to find the information I think I need .

I have three questions:

1. Can I use Mp3tag to set the group tag?
2. Could the tag be simply a number associated with the musical work? For example, could the numbers 5 and 6 for movements in a fifth and sixth symphony respectively?
3. Which field in Properties is used to activate and control the use of the Group tag, and what information should be written into the field?

I apologize asking these what are no doubt elementary questions but would very much appreciate guidance on using groups