Send Form Id id in Create Record command

Hi Experts,

I want to create record of a custom entity in JavaScript which I am able to do but I also want to send Form Id into it. 

How can I do that?

e.g. For entity X, I have two forms "Main1" and "Main2" 

Scenario:

if(condition){

Create record of entity X with form "Main1"

}

else{

Create record of entity X with form "Main2"

}