Hi, I am very new to SubD in Rhino and I just started modelling a vehicle on, tracks. I had this box which I subdivided and extruded (partly) in Z-axis and then this extruded part in X-axis. Now I have touching faces, but when I press tab, these faces do not seem connected and create a weird indent. See images for reference. How could I join, merge these faces?
example:
Thanks!