Burning two DVD's on one ?

[Nightcheck]

Hi - This might sound dumb - but is it possible after ripping two DVD's which are relatively small, i.e., 2 Gig or so each (I use DVD Shrink) to my harddrive - to then burn both of them to a single DVD (I have been using InstantCopy and Intervideo DVDCopy since they both allow for about 9 Gig per DVD).
If so, can someone explain in simple terms (I am truly new at this) , how it can be done (step by step)

Thanks in advance...
Nightcheck

[setarip]

Two simple possibilities:

1) Use DVD Shrink, in "Re-author" mode. If you desire, all audiostreams and subtitles can be retained

2) Use "TMPGEnc DVD Author" (different than "TMPGEnc") - Add each as a separate track. Using this software will limit you to one audiostream and no subtitles