HR Infotypes

Dear Experts,

I am creating a new infortype with ztable its displaying properly now problem is i want to put controls for that field

i have two check list boxes suppose when i select A1 from check list box 1 check box should display only A1 category data

check box 1 field is in table ZTEST1-FLD1

check box 2 field is in table ZTEST2-FLD1

how can i validate like this

my 2nd question is when i select the code form check list box i wanna display relevent description in the text object

all of these are in Screen Painter

Please help me to solve this problems