About Merging and Dividing Entities
You can use the Merge tool to join tangent lines, splines, or arcs that share an endpoint into a single entity. You can use the Divide tool to divide single lines, splines, and arcs into two or more entities.
Keep in mind the following points when merging tangent entities:
• They must be of the same type.
• They do not need to share a same point constraint.
• The curvature of splines does not need to be the same.
• When two entities belong to two nodes, the merged entity belongs to the node of the first selected entity.