how to change the defauTITLE BLOCK A3.dgnlt BENTLEY title block shown in generating cross sections, plan and profiles into other company title block as attached
You just need to create a DGNLIB with the borders that you want. Check the Step 7 in the following LEARN path.
https://learn.bentley.com/app/Public/ViewLearningPathDetails?lpId=111346
This path uses cell borders, but you can have the borders as part of the sheet file (rather than as attached cells).