Does anyone know why some features can't be grouped? I have a number of features for which the 'group' option is unavailable, even when those features are selected on their own. Is it something to do with external geometry? So far I've only noticed this on copy features which reference external geometry, some sketches and some extrusions.
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While this may be true David, it may be helpful for a newbie to see the features of which you speak, so they can learn themselves.
I've looked in the eLearning and there is no explanation of what can or can't be grouped and why. The help file is notoriously, no help.
I think you have already found the answer to the problem.
I've also ran accross features that I could not group. I think those were mirrored holes or features with external refs. Sometimes features related to features with external refs also cause problems.