You can define more models in the same input file, but not more versions of the same model …. except if you define versions of your model on different coordinate locations. Then connect supports with blind unloaded beam. Formally, it is now one model.
Before you proceed with your model it is necessary to delete bed elements. So far I find in your attached file a lot of errors
Beam elements with small length:
11195 ; 11196 ; 11201 ; 11206 ; 11208
11255 ; 11542 ; 11543 ; 11544 ; 11585
11588 ; 11589 ; 11600 ...
