Fixture from existing curved part

[scotS3G9D]

I have a model of a propeller blade and am trying to make a fixture to hold it for the second operation.  My plan would be to machine the first side, then superglue it into a fixture that matched the surface so I can do Op2.  It was suggested that I use the combine command and this works (at least for things like soft jaws) but I can't figure out how to get this to work for this part.  Essentially, I'm trying to extrude a square block up to the bottom of a curved surface. 

I'll attach a f3d file...sorry, it's a mess but should be able to convey the idea.  I'm self taught, and not taught very well, I might add, so Fusion is a challenge for me with anything other than squarish shapes. Thanks!

[aliobidi]

Hi , 
can you draw a sketch hand of what you need to make ?

[scotS3G9D]

Sorry for the comical sketch.  I want to extrude the grey base up to the yellow part along the outer edge shown by the red lines.  Hope this makes sense?

[jhackney1972]

You can combine your base plate and the supporting body if you desire.  Model is attached.

[laughingcreek]

it helps to  bring your profile in from the edge a bit.-

[aliobidi]

here we go .. extrude 100% to outer edges  
your file below 

[scotS3G9D]

Thank you, guys!  Now that I've seen how you did it, I am able to get it to work as well.

[jhackney1972 · Accepted solution]

Do not forget to Accept Solution since you have your answer.  This helps others find the solution to similar problems.

[scotS3G9D]

Thanks, John...will do.