Table to Table Relationships

I can probably help you, but first I want to understand if the relationship is built properly. When you view a job, do you see an embedded list of invoices on the job record form?

assuming that is the case, and let's say there is a job with three invoices. It sounds like you were trying to roll up information from the children up to the parent record. Can you give me an example of what you would like to see on the parent record?  For example, did you wanna field containing all the dates of all 3  invoices?  How would you want to summarize those check boxes?