This WIKI is on transporting a selection screen variant from one system to another.
The process to be followed for transporting a variant :

1.    Go to transaction SE38 and Enter the name of the Program for which the Variant has to be transported.

2.    Click on "GOTO -> VARIANT"  .

3.    Click on "Utilities -> Transport Request". This will internally call a program RSTRANSP.

4.    Click on "Execute button"  OR Press F8.

5.    Choose the Variant which you want to transport, Click on "Continue" You can also choose multiple variants at a time.

6.    Select an existing Change Request, or Click on Create a new Change Request.

7.    Go to transaction SE01 and release the Change Request as you do for any other change Request.