U shaped cut

[George777]

This is a U Shape cut into a solid block. I've got the geometry in place ( I presume) but can't figure out how to cut the shape out of the solid block. I'm using Solidworks 2004.

[George777]

Here's a zip of the part; still trying to figure out how to cut it.

[clembrant]

knit surfaces and use cut with surface

[George777]

So simple,..... cut with a surface. Thank-you !