Don't do it.
There is an inescapable tradeoff between making a gel layer thick (eg for sculpting), versus making it highly colored. You can't have both, because the more colorants are added, the more UV light is blocked. Intensely colored gels can ONLY be applied thin -- otherwise the UV light will not penetrate and you'll have undercuring, which can cause product failure and can also expose the customer to the sensitizing effects of uncured acrylates leaching out onto the skin.
So please do NOT mix sculpting gel with colored soakoff gel. It's just as dangerous as mixing gel with nail polish, and for exactly the same reasons.
PS... You can certainly apply colored soakoff gel OVER a sculpted gel, as long as you cure each layer properly in turn. Just don't mix them up before applying.