no you didn't understand
heres what i want
building A
has four upgrades it can reasearch (none of them change the building)
Upgrade 1
Upgrade 2
Upgrade 3
Upgrade 4
now i want it so when you reasearch lets say Upgrade 1 it doesn't allow you to reasearch upgrade 2 upgrade 3 or upgrade 4 at any building a's. But it needs to work with any/all of the upgrades |