Hello, highdef11. Welcome to the forums!
Many, many,
many commercial (and probably a few freeware) products exist to do this.
There's a Stuffit product (I forget the name) that can create "segmented archives." I think DiskDoubler can do this too. Norton Utilities has a program which allows you to create an backup archive that spreads across several floppy disks.
However, you may be able to to this with just DropStuff (It comes in the "Internet Utilities" folder on OS 9 Macs) and a text editor.
Open DropStuff. In its preferences, tell it to encode the archives it creates with BinHex. Now tell DropStuff to archive the files you want to archive. It will create a file with a name ending in .hqx
Open this file with a text editor. It will look like a bunch of random text, with a note at the top that says the file needs to be decoded with BinHex.
Divide the file into sections and save them onto floppies. Be sure to note the order in which the sections go!
Then, when you want to take it off the floppies, use a text editor to piece the sections together again. Expand the file with Stuffit Expander, and you're finished!