Crystal and Epicor not playing nice

I am having a lot of issues with getting our Crystal reports to display the way we would like them. Most of our troubles are related to Pack Slips, Pick Slips, and Invoices. Most often our issues arise from the bin locations causing multiple unwanted line items to show in these three reports, that we can't seem to find a way to group them. I'm not sure what questions to ask, but I'm hoping I'm not the only one that has had trouble working with these three reports, and could lend some advice on how to tame them.