I just upgraded from version 7 Adobe Reader to version X 10.1.1, previously when I wanted to insert another pdf into a document it was as simple as choosing the "insert" option. However, in this new version, I don't see any options at all like this. Would greatly appreciate your help in figuring out how to combine PDF's in 10.1.1. Thanks so much!
If you want to add pages from one document to another, you'd select: Tools -- Pages -- Insert form File
If you want to attach a document to a PDF as a file attachment, you'd select: Tools -- Content -- Attach a File
If you want to do something else, post again with more information.