Displays the options that you use to remove a split.
Seam Properties
Opens the Seam Properties Dialog, which you use to view and modify the properties of the seam that you are about to un-split in the model.
Select
Specifies the seam that caused the split that you want to un-spit.
Un-Split
Removes the split from plates affected by the selected seam, merges the plates back into a single plate, and leaves the selected seam in the model.