Hi, it would be more useful if you mention why are you using three files if these are initial conditions for two input i know you can write it as

** --------- I N I T I A L R E F E R E N C E - M E S H D A T A ---------

**

*Initial conditions, Type=NODE REF COORDINATE, Input=node.inp

here node.inp contains reference configuration information.

for more u can refer manual problem

http://abaqusdoc.ucalgary.ca/books/exa/default.htm?startat=ch03s03aex103.html

Thank you.

If the three input are for the same job, you can copy the main model twice and change the input in the two other to the remaining two input parameters. With this, you can run them simultaneously