I have these to differant parts is there a way in an Assembly Drawing that if I change a dimension on one it will change on the other
That looks like a good case for configurations. Both parts in one part file and configurations suppressing/unsuppressing features and changing dimensions that need to change.
Wayne has the most reliable and easiest way. Another method is to have an assembly variable that both parts look to.
if you edit a part in the assembly context, then edit a dimension or variable, you can left click the assembly variable. The only caveat is if you open the part in isolation sometimes it throws a phantom error that it cant find the external reference. I say phantom because this only happens when the assembly is not open as well and its not a deal breaker for me.
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