Editing 2 worksheets at once

Could you please explain in more detail?
Do you want the two worksheets in one workbook first?
... and then you can edit them in the workbook anyway.
What do you mean by simultaneously editing.
At the same time, it would be desirable to know which version of Excel it is and which operating system it is on.
It is best to insert both worksheets (without sensitive data) and explain your plans on them.

Thank you for your time and patience.

Nikolino
I know that I know nothing (Socrates)