1.  If you choose manual sync with the 'By Date'  option then order within the dates and its relevant data will be sync to selected CRM. (If the order doesn't exist in selected CRM).
  2.  If you choose manual sync with the 'By Order No'  option then the order and its relevant data will be sync to selected CRM. (If the order doesn't exist in selected CRM).

NOTE: Don't manual sync the data unnecessarily. It uses most of the API limit.