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How can a make drivers from a part family available in 2nd level of the assembly?

Example:
Part has parameters as drivers in a family.
Part Family is included in Sub Assembly, drivers working as expected.
When including Sub-Assembly in Main Assembly the drivers from Part Family is not available.
If i try to create a Family from Sub-Assembly there is no parameters available to create Drivers from.

Do i have to link drivers from Part Family to local parameters in the Sub-Assembly?
If so, how is that done?

Thanks

I found a solution that seems to work:

Create local parameters in Sub-Assembly, same names and values as parameters in Part Family.
Edit Inclusion of Part Family in Sub-Assembly and set values of Part Family Drivers to name of corresponding Sub-Assembly Parameter(s), in that way the parameters are "linked".
Create family from Sub-Assembly and define the parameters as Drivers.
Include Sub-Assembly Family in Main Assembly, the Drivers can be modified as expected.

If anyone knows of a better way, please share!