Create an Open Document Text file with placeholders for Netfabb to fill
Two types may be placed in a report template:
Named variables must first be defined invisibly in a location where they do not interfere (a "Set variable" step). This is where Netfabb actually deposits the value in the report document. Then the fields are set up where the actual values are to be displayed (a "Show variable" step).
Image fields do not require a definition step like named variables do. Their fields are set up directly in the places they are to show up. They do, however, require a placeholder image that must be prepared in advance.
Both named variables and images are given names so that Netfabb knows what to put into the placeholders. For a list of accepted names refer to the Creating reports reference.
Fields are placed with the Fields dialog of LibreOffice Writer.
Opening the Fields dialog
From here you can alternate between positioning the cursor in the main document window and defining new or selecting existing variables.
General steps for placing a field
The Insert button is now active.

Display of field names disabled but field shadings enabled

Display of field names and field shadings enabled