Datalist with checkboxes

Question

hi i have a requirement...i have a form which has to be dispaly company name and subcategories will be dispalyed with checkboxes ..

when user wants to search his company name then that company name,category will be dispalyed..subcategories also will be displayed with check boxes..

my requirement is already user has posted his company with several subcategories..when user wants to edit his company details all subcategories based on category will be dispalyed with checkboxes..

iam getting checkboxes with subcategorynames my requirement is already selected subcategories will be checked and otheres are unchecked for user understanding..plz help me