Powershell script to migrate user from one domain to another then move them to a new group on the new domain

#get list of groups the user belongs to
$GroupNames = Get-QADMemberOf "TestMigration6" -Service "microsoft1.contoso.com" | Select-Object -ExpandProperty Name

#Move the user via admt from domain microsoft1.contoso.com to microsoft2.contoso.com
admt user /N "user1" /IF:YES /MGS:NO /SD: "microsoft1" /TD: "microsoft2" /TO:"test users" /UUR:YES /PO:Complex /FGM:YES

#add user to the groups in microsoft2.contoso.com
$GroupNames | ForEach-Object { Add-QADGroupMember $_ -Member "user1" -Service "microsoft2.contoso.com" }


#this step I need to take it a step further to move the users from the groups they were placed in microsoft2.contoso.com and move them to a group with the same name only GBL_FLS_ is now in front of the name. the example is using dsget but I would like to continue with powershell.
dsgetgroup "$GroupNames" -members | dsmod group "GBL_FLS_$GroupNames