I have had this struggle with the toolbox wizard for a long time. If i want to start with a standard toolbox part and then modify it to match features i want to show in my assembly drawing what is the easiest way to do this. Lets start simple and say i want to put a few holes in a piece of angle Iron so that i can bolt the angle iron to another structural member. In the past i have had my assembly try and continue to use the unmodified part instead of the toolbox component i did a save as with into my working directory.