Associate Family Parameter

When you are working with nested families associating parameters can really help linking your parameters from the nested family into the parent family. The only problem is that unless you know they are there you would miss the Associate Parameter button.

When you select your nested family any of their instance parameters are visible, in the Properties Dialog box the little grey button on the right is the Associate Parameter button. You select this to associate a parameter from the nested family to a parameter in the parent Family.