Hi @Apoorv0802,
Here is a sample velocity template that could fit for you :
{
"id": "350b61cf-acca-4f1c-a3d7-d186b6b7e556",
"name": "UID_prefix",
"type": "static",
"attributes": {
"ID": {
"attributes": {
"attributeName": "File_Number",
"sourceName": "Employees"
},
"type": "accountAttribute"
},
"value": "#if($ID.length() == 6)U$ID#{elseif}($ID.length() == 7 && $ID.startsWith(\"10\"))UA$ID.substring(2,$ID.length())#{elseif}($ID.length() == 7 && $ID.startsWith(\"11\"))UB$ID.substring(2,$ID.length())#{else}$ID#end"
},
"internal": false
}