Is there a way to create a autofill like Calculations in Drop-Down Fields???
Not in the same way as single line or number fields. What exactly are you trying to accomplish? It would help to understand the use case to determine what approach would give you the desired results.
Okay when you choose something from the drop-down list I want to copy the one I pick from the drop-down to go the the next form just like autofill or something??
Unless you're talking about a second dropdown, then you can totally set another field equal to a dropdown using a Calculation.
If the field is on a different form that comes after this one in the process, then you could also set the value using a default value.
However, if you want to carry the dropdown value forward to the next form, why not just use the same variable on the next form and make it read-only if necessary?
Those are some good point but,
I'm talking about when you have two of the same dropdown on the first form I already fill that one out and when I go the next form, the second will have the same one dropdown list but instead of fill it out again I want to autofill same just like the first form?
If you're using entirely separate variables, then you'd need to do that with JavaScript; that's pretty much the best option since calculations and defaults can't be used.
I'm just trying to determine why you need them to be separate variables rather than just having the same variable/value displayed in the next step.
Not saying there's no reason to do it that way, just trying to understand the use case.