How do I import features simultaneously into multiple sequence files in a collection?
Create or Open a Collection of Files
Add sequence files to a new or existing collection. For more information, see Open a Collection and Make a New Collection and Add Files to a Collection.
Select the Sequence Files to Annotate

Select multiple files in the collection list using Shift-click or Ctrl-click (Windows) / Cmd-click (macOS). To select all of the files, click Edit → Select All.
Import Features from a SnapGene File

Click Features → Import Features → Import Features from a SnapGene File... .

Use the dropdown menu or the Browse button to select the source file, and click OK.
Set The Detection Threshold

Set the detection threshold using the dropdown menu. To hide any imported features that are hidden in the source file, check the box labeled "Preserve feature visibility settings".
To avoid creating extra copies of existing features, check the box labeled "Do not duplicate existing features".
Click Add Features.
Save the Modified Sequences

Each file that has been annotated with new features will be marked with an asterisk (*) to indicate that it is unsaved. Click File → Save All, or use the "Save" dropdown menu in the main toolbar and click Save All. The new feature annotations will be saved to each file.
View the Individual Sequences

To view the new features, select individual sequences in the collection list. If you wish to edit or remove certain features then see Edit Feature Qualifiers and/or Delete Features.