Join Multiple SWF Files Into One Software

Hi, is there anyone who has experience with joining multiple SWF files into one? For example, you have a problem with your FLA project because your FLA file is too large and you have to separate it into parts, into several different FLA files. When you finish all your FLA files and make several different SWF files, can you join that multiple SWF files into one functional project/software/video as one SWF file (with all functional AS codes and animations) ? Is it possible? I heard about Sobolsoft software "Join Multiple SWF Files Into One Software", I tried it and it looks fine but I`m not sure is everything (100%) functional? Is there anyone with experience with that of similar software?

since you are posting in AS2 section, I can't be 100% sure, but in AS3 mode you could just give your symbols class names and export SWC (libraries). then in your final FLA you could import those SWC files and create symbol instances by script.