If you are meaning a Family Tree Diagram, then there are several options.
There are two or three companies who will take your Project Folder and
print a chart direct from Family Historian.
Alternately you can save your diagram as a single PDF (with in some
limitations) which any printing company should be able to print.
I would like to present a family tree to a publisher in an
format which a printer would be able to use -
does anybody have any suggestions please?