Hi! I would insert parameters in a product with some parts. I tried to do this, creating a Knowledge Engineering Specification (as suggested in f1 helps of the commands). Then I create a parameters (and I've tried also with an external parameter) but when I tried to add formula and select an engineering connections than I want to have like parameters, I cannot modify it with the parameters; so this result unuseful. I tried to do in different why, starting from the engineering connection but the 3ds told me that it doesn't belong to the current document. I don't know how to do. Thanks for the help.