In the dialog, you can choose whether to apply the new workflow retroactively.
Choose Apply to New Documents Only to only apply the new workflow to future documents only (i.e. all existing documents will retain the old workflow).
Choose Apply to New and Existing Documents to apply the workflow to all documents in the project (both new and old documents will receive the new workflow).
If you chose Apply to New and Existing Documents, you’ll get a special dialog:
This menu lets you choose how to apply the workflow to existing docs.
If some of the documents in your project have already been translated, choose which phase they should be “pushed back” to using the drop down menu.
With the radio buttons, choose whether to add new target languages to the existing documents.
Click Apply to apply the new workflow to the desired documents.