The Parameter Value in Testbed File should be same as Device Name.
In Open step description we need to give device:[ ]. Inside [ ] we need to insert the Parameter created in Step 1.
We need to enable the Field Substitution for Open Step under Step Properties --> General --> Command --> For the Command field, perform command, variable and backslash substitutions.
We need to give a default session for the procedure under Procedure Properties --> General --> Default Session.