Scripting issue: select options values in screen recording

Hi Experts, I have an issue where we need to capture values in select options based on check boxes selected in first screen . if I have first check box as g100 and second as g200 and third as g400 . When I enter IW28 transaction I have to populate in select options these values based on user selection in first screen . Is this possible to do scripting for this case?  the screen recoding can only take low and high values . incase I would want to see g100 and g400 how can this be handled ? as the selection will take all values in between. Kindly Suggest. Best regards, pradeep