To create a new sequence file from a text, select the File ‣ New document from text main menu item:
Skip unknown symbols / Replace unknown symbols with — you can select either to skip unknown input symbols or to replace them with the specified symbol.
Document location — a location of the created document.
Document format — a format of the created document. Currently available formats are FASTA and Genbank.
Sequence name — a name of the sequence in the created document.