To copy fields from one record to another, check the boxes to the left of the fields you want to copy and then click on this icon 
in the other record:
The copied fields will show up in yellow:
You can also use this functionality to duplicate one or more fields in the same record: check the box(es) next to the field(s) and then click the same icon . This can be useful if you only need to make slight changes in the fields (for example 993 fields with draft resolutions that all start with A/C.4/L.)