RDS - RI Prepay EC2 - RI Prepay Redshift - Reserved Nodes Prepay DynamoDB - Reserved Prepay Read DynamoDB - Reserved Prepay Write ElastiCache - Reserved Nodes Prepay Elasticsearch - RI Prepay Savings Plan - Upfront Fee
These prepays are also relevant in Custom Line Items. For example, if you need to create a Custom Line Item that is not based on upfront payments/prepay services, you would want to exclude "Prepay Services". However, you will be blocked from excluding other Services if you select "Prepay Services".
Notice in the below screen shot that you cannot select anything outside of "Prepay Services".
In that case, you won't be able to use "Prepay Services, and will need to manually select the above list of AWS prepays to replicate "Prepay Services". Keep in mind that this list can change based on AWS or CH supporting more reservable services.