Blender Merge Two Edges Into One

Merge vertex tool you can merge two vertices on the same mesh together using the merge vertex tool.
Blender merge two edges into one. Right click to select the first object one which you do not want to be the parent. In object mode you can use the border select or lasso select tools or you can simply shift right click objects to add them to your selection. Then either 1 press s 0 enter dot s zero on normal pad. Shift select the closest vertex on the common edge.
Select one non shared vertex and snap the cursor to it shft s 4. To merge two faces sharing an edge you have to merge both common vertices to the outer vertices of any one of the two faces. Once everything you want joined is selected you can either left click the join button in the toolbox as shown in the image or you can simply press ctrl j on your keyboard. Select the middle vertex then select one of the connected vertices or vice versa.
If you want to merge edges from different mesh objects you must first combine the meshes into a new mesh using mesh combine. Alternatively a second method you could try is to put them really close together try selecting all the bottom dome loop then hit shift s cursor to selection put your manipulator into cursor mode from your screenshot it is now on median point and select the toop loop of the cylinder. Here s how to join two or more objects. Help joining 2 edges into 1 edge select the middle vertex and dissolve it with ctrl x not sure if this will actually work.