userform with 3 comboboxes and textboxes send to sheet

hi
the userform has 3 comboboxes and 12 textboxes i have copied the first combo1 to sheet3 'a' cell the textboxes will be added to cells b,c,d on the same row
my question is combo2 and its textboxes need to be added to the next row
then combo3 to the next row,the first one copies data over but not the others have played about with it and only one row copies,
cheers colin