Mantling position change

Please make it so that we can change the size and position of the mantling without affecting its color

Example

sable
seme de lions or armed and langued gules
a cross engrailed checky sable and argent
a cross voided engrailed gules
in fess point an escutcheon argent
a bend sable
in fess point an escutcheon
quarterly
I
or
a cup gules
IV
argent
a bear natural rampant gules
II
sable
an escutcheon gules
two dragons rampant vert langued
and winged gules armed argent shown larger and much
taller confronty a bordure engrailed or
III
sable;;
in chief a crown or
in dexter and sinister flank a sword argent
hilted and pommeled or
achievement a knight's helmet a torse of gules
and or crest an owl displayed argent
mantling sable and or
supporters two lions or armed and langued gules
crowned or
compartment a mound vert shown much higher slightly
higher