Using Part drawing as a reference

Hi Kids!

Using SW 2016, in a Part Drawing...

I saved-as a part to another file name. I then used this part as a reference to create another part, then deleted the original part.

I get dangling dimension errors and all kinds of things SW dont like. How can i simply use another part file as a reference to draw addition parts without Solidworks cussing at me?

Thanks!

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