bp_set_profile_field_set_count( type $field_group_id, type $user_id, type $count )

function bp_set_profile_field_set_count ( $field_group_id, $user_id, $count ) {
    $max = bp_profile_field_set_max_cap();
    $count = $count <= $max ? $count : $max;
    
    return update_user_meta( $user_id, 'field_set_count_' . $field_group_id, $count );
}