Need to remove the groups from the list based on another field value on Change Request form

[Arjun Reddy Yer]

Required help @Vasantharajan N @Ankur Bawiskar 

As I need to remove the groups from the list on Change Request Form

Change Request Form

when 

Condition 1. Assignment Group contains "GTO" or "SSHK"
OR
Condition 2. Affected BU contains "Group Office" or "SSHK"

AND

If condition #1 met and condition #2 NOT met, then do not add any of the below BU Owner Approval List :-
GROUP OFFICE-ONPREM-PLATFORM-OWNER-REPRESENTATIVE-APPROVER
GROUP OFFICE-NETWORK OWNER-REPRESENTATIVE-APPROVER
GROUP OFFICE-CLOUD OWNER-REPRESENTATIVE-APPROVER
GROUP OFFICE-END USER OWNER-REPRESENTATIVE-APPROVER

Need to push below mentioned groups to Approval List based on Affected Technology

Affected Technology          Groups

On-Prem Platform       = GTO-TS-CAB-CHG APPROVER
On-Prem Network      = GTO-TS-NETWORK CAB-CHG APPROVER
Cloud                            = GTO-TS-CLOUD CAB-CHG APPROVER

As off now created Business Rule to push the Groups to Approval List

By using below Business Rule I'm trying to push the value to Approval List field.

But I need to stop adding or if the group is added means then need to remove groups in BU Owner Approver List field

[Vasantharajan N]

@Arjun Reddy Yer - if you BR is running on the expected condition why don't you have the check to validate whether the expected groups are available in the field, if yes then remove it in the script? Can you try the script and share your script here to further tune it if required.

This will definitely a good experience/opportunity to learn scripting So please give it a try. 

[Arjun Reddy Yer]

Here the thing is I'm trying to push the value to Approval List field but I need to stop adding or if the group is added means then need to remove groups in BU Owner Approver List field