To increase your contribution amount, you can simply add more units to your CSTTM Advantage Plan. These units represent your share of the CSTTM Advantage Plan. You can keep adding units until your beneficiary is 13 years old. These units are offered to you on the same terms as your original plan. To add more units to your plan, please contact your Sales Representative. Please note that there will be a $200 Sales Charge with each additional unit purchased. The total contributions that can be made across all RESPs for your child is $50,000.