HSA Seeded Employer Contribution

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Hello, 

Our client has seeded HSA contributions based on the level:

Employee - $600

Employee + Spouse/Child - $750

Family - $1000

I am wondering how to set this up so that in self-service an employee can see the seeded amount set as an employer contribution and then also elect the remaining amount to contribute. For example, if the EE chooses the EE only option, they should see the employer contribution of $600 and then also be able to put in a $ amount that they want with a max amount of $3200 - however, the $600 that the employer contributes needs to be reflected so that the employee can only elect the remaining $2600. Any thoughts/ideas would be greatly appreciated!