If you want to get overall dimensions automaticly into your drawing tables here is a way to do it.
You can make relations in part template or assembly template that will handle asigned dimensions and convert them into parameter that drawing table raports. Any changes on those part dimensions with regen will reflect in raported parameter.
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Basicly template has relations in initial relations and post regeneration.(Open template.prt and look in relations)
Combinations of what can parameter("GABARIT") for overall dimensions show with this template are:
AxBxC
AxB S Sheetmetal Flat
AxB L S Hollow Bar
AxB L Bar
FixL S Pipe
FixL Circular profile
DEC in initial ones defines the how many decimals parameter will have.Just add zeros or remove them.
You can always copy those relations in your template and use diffrent name for parameter.
Hope someone finds this usefull.
Cheers