Do you want to record the ISO files themselves, or the contents of the iso files?
If you want to record several iso files on a disc, as they are, you can just record them as data files - there should be no problem with that.
If you want to record the contents of several iso files to a disc, I think you will need to extract the contents (ISOBuster or WinRAR) to separate folders and record them like that. There may be another way, but I think not, because I believe ISO images depend on the starting address on the disc, and most assume they start from the very beginning.