I'm assuming you mean the "R7" and the "R12" radii for that cutout?
Simply select the Fillet command and input the first size, select the edges, then select the "click to add" text in the menu and input the other radius size and then select those edges, hit Apply when done.
Here's an attmpt. The file was created in Inventor 2012. Please move the End of Part marker down, if necessary.
Here are a few hints on starting this part. Remember to keep your sketches simple.
I hope this helps.
Best of luck to you in all of your Inventor pursuits,
and now apply fillet features ... then pattern the cut and fillets
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