dependent parameters

[aliex]

I have three geometric parameters.

a, b and c.

i want to know where and how can i make parameter b dependent on c?

for example that c must always be greater than b, if b[5...10] und c[4...20]

a matrix was created by DesignXmodler.

but errors were shown.
is there an IF statement that can be used there?

can I program this somewhere in ANSYS? through APDL or Python?

thanks a lot