How do I get the last value entered into a form to carry forward until it is changed?

Hi - I have a small manufacturing business and am working with creator to develop apps to collect data at various work stations vs filling out paper forms and manually entering the data. A lot of the entries will be repeated and do not want to have to re-enter them every measurement. For example I have an order number, width and length field - the order number and width field will be the same but the length will vary for that job.

Thanks for the help.