When in the invoice section of creating a job type template, 200- Sales is a default account and refers to the account that the paid invoice will go into, as the service is essentially being sold and will class as revenue.
You can update this on the individual line item via the Web Portal.
Just go to the Settings Cog > Accounts > Items > Edit the Item you want to change the account code for > select the Account Code, or create a new one.
You can also go to the Settings Cog > Accounts > Account Codes, where you will see a list of account codes that are added by default, and you can edit them or add new ones.