I performed the save as but still I can not do the group operation. Do you think because the part is modeled in context (has references to the other part in assembly).
Group failures are sometimes due to references that are part of features that are not in the group. For example, external sketches can interfere.
The best method of determining this is to select items, such as the rounds, that will group, group them, and then try to drag other features into the group. I recall this gives more diagnostic information about why it won't group - such as "Can't group X without Y"
the problem was that I created this prat in another assembly and then used the save as function to create new parts and assembly. Some references were to the old assembly. So I needed to reopen the sketches which were referenced by the old parts (assembly).