Need urgent help on a plastic part!!?? Autodesk Inventor

I have attached an image to better explain.
I need to make the domed part concave, remove all the extra material and leave only a 2mm wall. I cant seem to figure out how.
Please contact me asap at nunofelix79@yahoo.com if you know you can help.

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3 Answers

I removed the file, since i figured it out. Sorry.
Thanks for the attention though.

 
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