Hi @George P , another option I've seen customers do is to use the "Related Links" feature to trigger a modal popup list.

Many many years ago sncguru made a page on how to create a record list from a popup here:
https://www.servicenow.com/community/it-service-management-forum/is-there-is-a-way-to-have-glidewind...

Here's an example that follows the same principles and creates a "Related Link" on the incident form to replace the default "Incidents by Same Caller" Related List.

Find out how the related lists builds its list of records.

1. Open "System Definition > Relationships"
2. Open "Incidents by Same Caller"

As you can see this related list is built by querying the incident table for any record where caller_id is equal to the caller_id of the current record (i.e. parent.caller_id). You will need to re-create the "sysparm_query" parameter of the related list that you want to duplicate.

Create a new "Related Link"

1. Click "System Definition > UI Actions"
2. Click "New"
3. Fill out the form values as follows:

FYI - the GlideDialogWindow API has been replaced with a newer API, the GlideModalV3 - Client. You should probably use the newer API.

Good luck!