Microstation_How to modify title block without change the original one

Sometimes, difference department use similiar title block. it need change a little bit, for example: erase one line, or some text. but we can not change the default title block according the company rule. So, what can we do?

*The idea is mask it.
1. Fence the part that you want the mask.
2. Click File-Reference-Tools-Clip Mask