Hello

I am new to SolidWorks and need a little help with taking this offset cone shape and unbending to a flat pattern for CNC manufacturing. I have read some of the other post, but I am still doing something wrong in either my creation of the cone or in the conversion to sheet metal. Most of the difficulty may be in the offset. I have seen this done in a example before, but without instructions.

Thank you in advance and I really appreciate any help that can be given.

I have attached the drawing at the point I cannot go any further.