CAN I USE ULTRAISO TO CONVERT VOB FILES TO DATA DVD FILES? IF NOT, WHAT OTHER PROGRAM CAN I USE?

Hi.....I urgently need some help!!!! I currently use DVDShrink to rip my DVD’s to my harddrive.DVDShrink compresses my DVD’s so that if I want to burn them, a full DVD will fit on a normal 4.7 GB DVD Disc. I want to be able to convert the VOB DVD Files to DATA DVD Files so that I can fit more than 1 DVD on a 4.7 GB DVD Disc. I’ve burned 5 full dvd’s to a 4.7 GB DVD Disc...thanks to the fact that the files were written in DATA DVD format:). Can I use UltraISO to convert my VOB Files to DATA DVD Files? If yes, can someone please guide me through it. If not...are there any other programs that will be able to convert VOB to DATA DVD, that compresses it so that I can fit more than one movie on a 4.7 GB DVD Disc? I’ve posted a similar question on another website, still haven’t gotten any replies. Help will be appreciated. Thanks:)