You've given us 'what' you want to do, but not 'why'?

You said the 'program', is that what you really mean? The software executables don't get bigger, mostly because you can't make updates to the software.

Your original image files, the LR previews, and the LR catalog do get bigger, especially when you don't proactively purge (delete) old catalog back-ups that Adobe prompts you to make, but provides no automated method to prune. These are the types of details I'd like to understand behind your thinking of 'why' you even want to mess around with this idea.

Although you can move the image files inside LR, it's much more efficient to do this outside LR and just update the catalog afterward. I keep all my images on a USB Western Digital (WD) connected 4TB drive. The LRCAT remains local to the computer's disk, but this can be on the USB-drive too. You just copy the files onto the connected drive and then tell LR that's where they are. Once you're satisfied, you can delete the originals still on the computer.