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Replacing Polynomials with another Polynomial

So I am working with quotient rings so I want to be able to replace terms as there can be many representatives. Let's say I have a polynomial ring of four variables quotiented off by some ideal. Futhermore, we have

x*w "=" x*y+y*z

in the quotient. Is there some replace function that will let me replace polynomial expressions with one another? For example, if I had 3xw+x*y, is there something like

replace(3*x*w+x*y, x*w for x*y+y*z)

which should output

4*x*y+3*y*z