For example, I have a basis and smile left & smile right shape key. When I try to make the basis mesh fatter, the other 2 keys (smile left & right) don’t have that “fatter” basis mesh that I just created. It still use “slimmer” version (original basis shape key). I tried to use blend from shape as well, & it works fine if I only apply smile left or right. But if I apply value:1 to both smile left & smile right, the “fatter” becomes double (superimpose the shape key), which I don’t want.
However, I have tweaked around & found the solution on this at here Shape Keys+. Thanks a lot for the advice given anyway 