We have added the rental "from"  and "to" dates on the Potential and populated those to the Quote. On the Invoice there is no option to include custom fields from the Potential (or quote) - this seems like a bug or simple omission - the Potential, Quote and Invoice are all linked and should have access to the same data.

Is there a work around? Putting the from-to dates on the contact is not correct as people may re-book at at a later date.