You can combine and bridge as you have done, then afterward insert an edge loop at the center, delete one side, then re-mirror.
Or perhaps an easier way would be to just extrude those edges you want to bridge but stop when both objects meet each other. If you are working from origin you can easily use grid snapping or absolute transformations to line up the extruded components exactly in the middle.
Yeah Bartalon is right, also, assuming that you're in the polygons tab and the main side of your mesh is center pivoted to the middle.
To prevent the hassle of aligning individual vertices to the center for mirroring is to align it altogether by using the absolute transform tab and putting (assuming it's centered on X axis) 0 on the X axis.
Example:
And when mirroring, make sure on the polymirror inputs that the merge mode is Merge Border vertices (this is where the absolute transform aligning comes in check) and verify if the borders are aligned without any hidden faces/vertices in between by altering to wireframe view. (maya tends to have this sometimes xD)
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You can combine and bridge as you have done, then afterward insert an edge loop at the center, delete one side, then re-mirror.
Or perhaps an easier way would be to just extrude those edges you want to bridge but stop when both objects meet each other. If you are working from origin you can easily use grid snapping or absolute transformations to line up the extruded components exactly in the middle.
To prevent the hassle of aligning individual vertices to the center for mirroring is to align it altogether by using the absolute transform tab and putting (assuming it's centered on X axis) 0 on the X axis.
Example:
And when mirroring, make sure on the polymirror inputs that the merge mode is Merge Border vertices (this is where the absolute transform aligning comes in check) and verify if the borders are aligned without any hidden faces/vertices in between by altering to wireframe view. (maya tends to have this sometimes xD)