How to automatic generate invoices and revenue based on specific conditions ?

Summary:

If there is any way to automatically generate project invoices and revenue on a specific date/period that varies from contract to contract?

Content (required):

The customer has contracts through which the customers are automatically billed according to the terms of the contract.

For example, we have a contract of two million for a period of two years. The customer is billed with half of the contract value in the first year and the other half in the second year. Every six months, an automatic invoice is made for 50% of the remaining Contract Value.

Version (include the version you are using, if applicable):