process of combining 2 meshes into one not in object mode but in edit mode? I made a mistake of creating another mesh in edit mode so when I use ctrl + J to combine mesh it doesn't work. What would be a good way to combine 2 meshes together in edit mode since they are already considered as one mesh object? As you can see I would like to merge both the cone and the cylinder together into one single mesh. The cylinder is just a extrusion of the ball object. For now I'm going to re-add the cone in object mode then ctrl + j to merge.
What are you trying to do? Deleting the cone, adding it in object mode, and then using ctrl + j just gets you back to where you started. Its the same as adding it in edit mode.

Assuming you want to join them to one flowing mesh.


Select the edge loops with alt + rightclick
Search in the space search menu for bridge edge loops
Select it from the search


Before:


After: