Hi guys, looking to find solution for the following problem. hope u guys can help! thanks

i have 4 sheets, 3 containing different projects and 1 containing consolidated figures of those three projects.
Im looking for a way to "turn off" or deactivate certain sheet so that i can select which projects i want to be presented/linked on the consolidated sheet.

e.g.
i want SHEET 1 (project 1) and SHEET 2 (project 2) to be calculated/included as part of my formula on SHEET 4 (which is my consolidated sheet). i want the ability to be able to choose different combinations of projects which should give me diff result on my consolidated page

thanks a bunch!