Ok, so I'm supposed to turn them into PK3s? How do I do that? (And no, I'm not trying to give you attitude.)
You do not have to, you could use markers instead of folders. But PK3s are almost universally considered better anyhow, so let's go over that.
I personally recommend creating a new PK3 file and then moving everything from the WAD into it. To do this:
1. Open SLADE's start page, and click the "Create Zip Archive" button. Save this new zip archive and name it whatever you want, then close SLADE.
2. Navigate to the zip archive in your file explorer. Click "rename" and change the .zip to .pk3. PK3s are just zip archives with a different file extension.
3. Re-open SLADE and open the .pk3, as well as the .wad you already had.
4. Use Ctrl+C and Ctrl+V to move everything from the .wad over to the .pk3.
We're almost done, but now comes something a little bit complicated. You see, PK3s can have WADs inside of them. Why do I bring this up? Well, maps in PK3s are normally stored in WADs. I'll run through the process for doing this:
1. Go back to SLADE's start page, and click "Create WAD Archive."
2. Ctrl+C and Ctrl+V all the data lumps (the files within an addon) for MAP01 into the new WAD. In your case, this would be everything from the lumps named MAP01 and down in the screenshot you posted. Do not move the MAINCFG file into this new WAD, nor anything else.
3. Save the WAD as MAP01.wad.
4. In your PK3, create a new folder called "Maps" and place MAP01.wad into it.
5. Repeat this process for every map in your pack.
You're technically done, however I'm also going to teach you how to make opening your pack in Zone Builder much easier now that it's a PK3.
1. Open Zone Builder.
2. Go to Tools > Game Configurations.
3. On the left, select Sonic Robo Blast 2 - 2.2.
4. Click the "Add resource" button.
5. Go to the "From PK3/PK7" tab and add your PK3, then click OK.
Now, Zone Builder will load your PK3 as a resource, and that means it'll also load any custom textures, enemies, etc. for you to use.
One more thing: How to open maps from within a PK3 in Zone Builder.
1. Open SLADE.
2. Go to Edit > Preferences > Editing and click on the "External Editors" tab.
3. Click the + icon and navigate to Zone Builder, then add it.
4. Click "Apply."
Now, within SLADE, you can right-click on your map WADs and select Open > Open in Zone Builder to immediately open them for editing. Please keep in mind that when you now save your map in Zone Builder,
it will not be truly saved until you save the PK3 in SLADE! This is how most of us do it, and it's way faster and easier once you get used to it.
This completes the conversion process. However, keep in mind that the folder structure you were using was still not valid, and you'll need to fix it before everything will work. I have attached to this post an example, blank PK3 with a valid folder structure. You can delete folders you do not need, but do place your MAINCFG from the old WAD file in the SOC folder.
Hope this helps.