Janus
Hi Grau
As far as I know your only option is to upload and populate the taxon tree with all species, and then manually synonymize. There may be some way to do it through some direct database interface, but you should definitely know what you’re doing.
What I did was to appended ‘[syn]’ to all the synonym names, and then imported all the taxonomy. Then I searched for ‘[syn]’ in the taxon tree and manually edited that name (removed the ‘[syn]’) and synonymized.