Using ga, how do I write a code with bounds dependent on a linear function?

I'm new to GA and I need to maximize a revenue function with b's (& d's, but i might just represent it as one vector) as inputs. Now the problem is that every supplier has production bounds with production function a linear function of b.

From looking at https://www.mathworks.com/help/gads/constrained-minimization-using-ga.html I can see that the bounds are supposed to be vectors and the way I see it there's two possibilities: one may be able to redefine what the bounds are for (I just don't know how or if its even possible) or to write the function in the bounds itself.

Is there any way to write that code? Thank You