I have seasonal employees to layoff. We will top up the EI (Supplemental Unemployment Benefit Plan) from what I read, that money isn't EI Insurable. How do I set this up?

"Payments under a registered SUB plan are not considered as insurable earnings; therefore, EI premiums are not deducted." https://www.canada.ca/en/employment-social-development/programs/ei/ei-list/reports/supplemental-unem...