Once the banner is created you are can save this banner as a template by clicking Project --> Save as template  in the top meniu:

Then enter the template name and it will be added to Adform Creative Toolkit templates list.

For creating banner from templates follow to Project --> Create from template  in top meniu. You can select either custom templates or Adform's templates.. Simply select the required template, enter a project name and click the „Create“ button. Among Adform templates are the most common rich media banner types (e.g. Expanding + Video, Standard Polite and etc.). These are listed under the „Adform Templates“ tab (image below):