hi guys I'm trying to learn how to create a landscape. I have got several Mapbox nodes all placed where I want them but I need to remove sections from them to before projecting them to my Main hightfeild landscape.
all I want to do is lasso the parts I don't want so they have no effect on the final hightfield???
Please help brand new at this Houdini lark. thanks.

I'm not 100% sure I follow but I attached an example of isolating the height by drawing a mask.

sorry forgot to thank you for the tip @Siavash Tehrani