Start a new lsprepost: Click File > Import > LD-DYNA Keyword File. Open geometry_merge.k. Click > > .
- Select the radio button Merge edge. 
- Set the Edge gap tolerance threshold. The program will check the element edge gap automatically and merge the edges in case the gap is under the threhold. 
- Pick two NURBS elements. 
- Click to refine the NURBS element. 
- Click to add the new NURBS element into database. 
