A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
This formula will give you the name of the sheet (Branch 1) if you wanted to actually show this on the sheet or use it as text in an INDIRECT function or similar (to ensure the formulas keep working if the target sheet name were to be changed), but the answer to your question really depends what you want to do with it:
=MID(CELL("filename",'Branch 1'!A1),FIND("]",CELL("filename",'Branch 1'!A1),1)+1,31)
Cheers,
Dave