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Is there a way in sta / openroad to ignore a timing path that goes through two particular instances? In our multiproject chip no two project can be active at the same time, so I would want to ignore paths that include projectA AND projectB for example

set_false_path is the SDC command that you want to add

I believe it has a "through" option, but I'm not sure about *two* instances. You can do from and to as well.

yes, I'm going to try different options of set_false_path.
What I've just tried and it seems it supports (at least it didn't complain) is `set_false_path -through instance_a -through instance_b`

It seems to work and it seems the order matters:
`set_false_path -through instance_a -through instance_b` just ignores paths that goes first through instance_a and then instance_b and not the other way around