I have two trees conected via NDS2NDS.
I have a rule in the second tree that adds users to a couple of standard
Unfortunately when I migrate all the users from the other tree from time
to time, the driver overwrites or deletes the other group memberships
already present.

Comand Transform:
the rules is
if: classname =user
action: add destination attribute value
group membership
add to current operation
string value

how can i make it add the user to the groups i want without it overwriting
previous memberships?