Linking a cell to open a worksheet in another file

Linking a cell to open a worksheet in another file

Dear Zoho Sheet Team

I am sharing files B-00 to B-15 with you. B-00 is an index and each cell should be linked to open/close one of the other sheets. Is this possible? Do I have to insert buttons in the index sheet? Is a link only possible if all sheets are in one file? If this is so, how do I do the transfer?

Can anybody advise me please? Many thanks!

Hans