Filling volume between two surfaces

Hey there!

I am quite inexperienced with Solid Works. I'm designing a lid for a package and this is my first project.

I want to fill the space between the cylinder holes and the semi-spheres but I can't figure out a convenient way for doing it.

Please find attached a picture of the part I'm working with.

I'd be really grateful for some help!

Thanks!

Regards,

Rafael

SolidworksParts And Features