import a design in to webench

Currently, you cannot import a design into WEBENCH®. You can share designs created in WEBENCH®, but you cannot import a design from any tool into WEBENCH®.

You can have it create a similar design using TI parts if the requirements are known. You can then change the BOM components to make it as close to the existing design as possible (and using the Schematic Editor, you could make the topology identical as well). This is not a simple import, however.