Commercial building with bad roof deck

I'm working on putting a bid together for a customer. The existing roof has two layers(built up and single ply on top). There are quite a few soft spots when walking around. Went inside to inspect the decking and can tell a lot of steel will need replaced. I'm also told that the business must remain open throughout the entire roofing process. There will definitely be decking that needs to be changed at various times. I'm curious as to what others have done in the past to prevent debris from falling down inside the building? Suspended tarps? Thanks in advance

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What's underneath makes a big difference. A machine shop, and clothing store, a grocery store and a commercial bakery all have different needs, and I've done this on each, and more. Is the BUR asbestos? Is the deck fully exposed? Have made certain that this lion is dead before you decided you wanted to take a bite out of it?