it was in both assemblies and parts...mainly when you have multipul nodes in a drawing ( Or Spline eg.. an aerofoil!
I also found that when you were converting entities ( Thats solid-works language, forgot what it is in inventor.... basically use another face for referring geometry, if something went wrong, it would destroy the part!
Since i learnt solidworks ( The day after i got my NVQ Level 3 in inventor lol) i have never looked back, and have used solid works since... i can design much faster in solid-works than inventor!.. i guess its personal preference.
My FIrst cad package was turbo cad when i was 13 ( Downloaded it when it was free back then! ), and it served me well for foamies. i still occasionally still use it, as it has some brilliant features in, which acad, inventor & solidworks dont have..

.. Eg the ability to stretch an aerofoil in length without changing the thickness

, but it maintains the shape perfectly as sees it as a shape not a poly line
