I'm a recent convert to Solidworks after 20 years with another program, and still struggling a bit to remember everything. This is something I've done more than once, but apparently forget the proper steps. I have a simple assembly, with some parts that I need to join together to create a single mold. While in assembly mode, I go to Insert>component>new part, and go through the steps to created a new feature with the parts joined together. The problem is, this new feature doesn't appear to be associated with the originals anymore. I can modify the original components in part mode, but the new feature doesn't update. I know it's something simple, but just can't seem to get the steps right.