Sounds like you are trying to do quite a few different things.
First, I'll say - with code, all things are possible - well, most things at least. And if you can't write code (or don't want the cost of maintaining custom code), qRules can help you.
So - you want data imported automatically from Form A into Form B. If Form A has these fields promoted to a SharePoint library (assuming that it submits to a SharePoint library, and that the data you want to import is not repeating). Will all data come from the same XML? Or will there be multiple XML to choose from? If just one XML, you can simply create a data connection to that XML (as long as it is located someplace everyone who uses the form has access).
"Each day a new line is created on the form" - that is kind of tricky, right? You'd have to know when the form was opened if the new line had been created or not. But if you had a date field in the repeating group, and set it to today when the row was added, you could probably use that... again, though, you'd need qRules (or custom code) to add the new row - nothing in IP to do this for you (no "Add row" rule).