Hi @danatZQCD5, I'll try to make it clearer:
1. Create an empty surface and paste the surface of the red profile of your screenshot. Sample your surface again so you have your red profile twice in the same profile view. As in the following image, I have two pink-colored surface profiles exactly on top of each other.
In the image, you can see that my cut/fill hatch depends on those profiles.

2. Now, let's say your wetland limit goes until the station 0+200. Then. I applied a hide boundary to the surface so the second pink profile would appear just until this station in the profile view.

3. Change the boundary in the profile window properties.

4. Now the fill hatch appears just until the 0+200 station

This is what I understand you want. If it is not, please provide more information so I can try to give you another idea. See the file attached to better understand what I did.
Best regards!
Camilo Fernández
Civil engineer | Specialist in design, construction, and maintenance of roadways
