Extrusion between helical slope and plane

Hello

I'm looking to fill with material between the underside of the helical slope and the lower plane (material represented in red thanks to my talents on paint), do you have a tip the community?
I tried to fill in the material and then do a combined function but I didn't get the expected result.

Thank you in advance

Hello
A simple projection of the sketch on the plane and extrusion to the body?
If not, surface and make it a volume to combine.

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I hadn't thought about it... I started a sweep with a propeller in the opposite direction and then a combine function, but it requires more function than with your proposal! Sometimes, we want to make it complicated when there are simpler things! Thank you Cyril

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Hello

Create the thicker helical section, and I would have created the flange after.