Also, it looks like you're still using version 1 of the BX Clone Engine. I'd advise updating to version 2 as it fixes a bug that causes transforming clone characters to keep their old battle portrait.

Yea, I was using Version 1 B/c of the first guide video, was trying to make sure I did everything correctly and had everything in order until I ran into a/this problem to do the Zelda-Sheik Clone which I couldn't do. I mean Everything did load on Version 1 since I made her 3F ect... but after It tried to load up a stage it froze and I knew I was doing something wrong but couldn't find the answer. Now I'm using Version 2 and i re-did everything you said with Zelda and Sheik Everything finally worked. Thank you very much! for the explanation was trying to look everywhere on how to do it for 2 straight days.

Also when I transform from Zelda(Main) to Sheik or Sheik(Main) to Zelda There's no sound on their Secondary transformation How will i go about to fix this? (If anyone knows please, Thanks!)

Again, Thanks for the Explanation, Zelda/Sheik are one of my favorite and it was Killing me that I kept Failing to get them on and have some Custom Skins for them, But now I can, It's like a huge relief, Since Im on vacation I literally spent a straight 2 whole days sitting on my chair being on my laptop trying to find the answer and trying any way that I can think of from the info I've searched and nothing was working lol, felt like I would never find the answer and that my only way of playing a custom Sheik or Zelda is through Brawl+ that they already had. Now I can Finally relax and Enjoy.
- Just showing how thankful I am for this =)

Original                                           0B 0C <-- Offset
53 4C 54 43 00 00 00 30 00 00 00 01 00 00 00 00
00 00 00 0E 00 00 00 0D FF FF  FF FF  FF FF  FF FF
00 00 28 4B 0D CC CC CC CC CC CC CC CC CC CC CC

Edited                                              0B 0C <-- Offset
53 4C 54 43 00 00 00 30 00 00 00 00 01 00 00 00
00 00 00 3F 00 00 00 40 FF FF  FF FF  FF FF  FF FF
00 00 28 4B 0D CC CC CC CC CC CC CC CC CC CC CC

Like This? Sorry I'm a noob just trying to see if it's correct and that's how it's done.

Finally, open up the Slot Config files for both characters and change the Edit Flags (@0x0C) to 0x00000001, and change the Slot Characters (@0x10) to 0x0000003F and 0x00000040 for Zelda's Slot Config and 0x00000040 and 0x0000003F for Sheik's Slot Config. After that, you should be ready to go.

Ok, this is where I got stuck Where/How do I open the SlotConfig Files? And for the resources in "Fighter" Folder Do I put pac, pcs for Sheik and Zelda together in one folder or in separate folders? just wan't to make sure I'm doing this correctly (I have them separated). Lastly is it fine if I place Sheik as 3F first and Zelda 40 and in the CSS code 26,3F,40,29? Thanks to anyone answering, Been trying to figure out how to make Sheik First n Zelda Second For 2 Straight Days now Hoping that this is the solution.