Since your users are "not very tech savvy" I would suggest not to use the clipboard.
Clipboard actions are usually not visible to the user since they are done via keyboard shortuts. These actions are used by powerusers but from your explanation I can conclude that your user do not fall into that category.
You need actions that are visible and 'discoverable' by the user and you'll probably want to guide them, or they will probably never use it.
Here are two ideas that come to mind:
A 'Create new spec' option in the toolbar which opens a tool in which they can create a new specification using the information from other specs. This is quite an extensive solution though.
Show the list of specs on the left and let the users drag and drop items from the currently opened specs into other specs. Similar to creating a playlist in spotify or itunes. You have a list of playlists on the left and you either drag new songs into the list, or select a song and use the toolbar or contextmenu to say: 'Add this song to 'My awesome list of songs'';