When I give players donor roles from a Buycraft/Enjin site I currently just set there parent to the donor role that they purchase but this removes their staff rank.

I can think of some workarounds for this but all of them are pretty bad.

Could we have a way to set a users parent without removing their parents which are on different tracks?

For example,
lp u <name> parent set <donor rank> (but without removing their staff rank?)

Or is there already some easy way to accomplish this that I'm not aware of?

lp user <user> parent add <donor rank>?

The problem with that is that then the user potentially builds up like 10 different parents even though 9 of them are redundant and if I want to remove them manually I have to remove each one individually.

It also makes it more difficult when doing something like "parent info" because it makes it a lot more annoying to figure out which one is the highest/important one.

That's why I always like to remove their old parent but this is not possible with Enjin/Buycraft because you don't know what their old rank was

Use parent settrack

https://github.com/lucko/LuckPerms/wiki/Command-Usage:-Parent#lp-usergroup-usergroup-parent-settrack-track-group-context