I work with a client who uses a worksheet for customer data. The client
inputs data then sends the entire workbook to me by email and I add
additional information (dates documents are sent to customers etc.) and send
it back to them. I obviously do not want to overwrirte the worksheet either
at my end or theirs as it is continually being updated. I am sure that there
is a solution but if someone could assist that would be great.

Thanks in advance