DISSOLVESKETCHFEATURE command
Dissolves some or all sketch features but keeps the corresponding 3D solid.

Method
Specify a comma separated list with Sketch Based Features (for example, Extrude_1, Loft_1) to be dissolved. Otherwise, the command will dissolve all existing Sketch Based Features by removing their sketch features if there is more than one.
Note: The corresponding 3D solids will remain.