The link doesn't work. Might only work for people who are in that Facebook group.

Here is a link to a simple flat graft

https://m.youtube.com/watch?v=S1z_KcAkpq8

Here are 2 photos from fb

Credit Divyesh Jariwala

flat graft of 2 separate scion one on top of other, for a multi color plant

Here, super glue is used to glue multi scions on a flat graft

Credit, fb, Adenium Brazil group

Here is a link to another multi graft, using a standard techinque i have seen often used by bonsai folks, thread grafting, to graft roots and branches and what not, lol

http://99-40.com/adeniums/multigraft.html