Batch rename issue

I did a batch rename on a very large set of files in C1 and it went belly up. So now I have some files with new names and some with old names. I want to rename the rest of the files but need to specify a starting number. I have, say, "Texas-0001" through "Texas-327", and want to start renaming the rest of the files starting with *328". The basic select, right-click,*batch rename" doesn't let you specify a starting point for the numbering- it just starts where it left off last time or from zero if you've restarted C1 since you last renumbered files. Is there a way to do what I want in C1?