alternative to if - then statements in parameters

Say I have a block that contains a solid with a parametric length “L” and another solid with a length of “L2”.
Here’s what I want: If L is 100 – 200, I want L2 to be X, and if L2 is 201 – 300, I want L2 to be Y.
I would like to use an if then statement but Bricscad doesn't support this as far as I know. Are there any simple solutions?
thanks.

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