Exporting fics in series help(?)

This is probably a very dumb questions but is there was a way to combine fics within a series into one big fic (or file or doc or something idk) for exporting purposes.? I find I have been reading a lot of fics within a series. The individual fics are typically between 8-12k ish a piece. I usually only export (to my kindle) once it hits about 80-100k ish. Yes I can make collections for individual fics within a series, but I’m hoping there may be a less chaotic way to do this. I’m guessing probably not, but this sub is full of ao3 wizards and witches so can’t hurt to check. Tyia for any info.!