You might like to take a look at Defaults.zip in my public databases folder at:
https://onedrive.live.com/?cid=44CC60D7FEA42912&id=44CC60D7FEA42912!169
This little demo file illustrates how, when a new record is inserted, the contents of a bound control can be set as the default value for that control when further records are inserted. This done by means of a small check box beside each control. Two methods are illustrated, one in which the default values are set for the current session only, the other in which the default values are carried forward to subsequent sessions until cancelled.
Note that if this is done for a form opened in datasheet view it will be necessary to set the form's detail section's tab order so that each check box appears beside its relevant column.