I drew the outer hollowed body and the cylinder on 2 separate parts but I can't figure out how to draw this rib so that it is passes through the centre of the cylinder, a video of a similar example would help a lot
- It looks like the part is symmetrical about the YZ plane.
- Create a new sketch on the YZ plane and draw the rib. Extrude it symmetrically. You may need to work in wireframe or "show hidden edges" (or whatever SolidWorks calls that).
- No, you wouldn't create a separate part. The piece is all one.
- I have no idea why you posted a picture of a cylinder.
Figure 1. One way of creating the part is to draw half of it and mirror when complete. Screengrab from OnShape model.