Adobe ACROBAT READER 7.0 Manual page 104

Grouping markups
If commenting is enabled in a PDF document, you can group two or more markups
together so that your comments function as a single comment. You might group your
markups temporarily to move them to a new location or to modify their properties rather
than editing each one individually. Grouping also helps to distinguish your markups from
other reviewers' markups in a document review.
Note: You cannot group text edit markups.
To group markups:
1. Using the Hand tool, select a markup.
2. Ctrl-click (Windows) or Command-click (Mac OS) to select all the markups you want to
group.
3. Right-click (Windows) or Control-click (Mac OS) anywhere in the selection and choose
Group from the pop-up menu.
To ungroup markups:
Right-click (Windows) or Control-click (Mac OS) the grouped selection and choose
Ungroup from the pop-up menu.