If your assets are very similar, an easy way to create assets in WorkGuru is to copy an existing example.  From the asset details page of the asset you want to copy, click Copy Asset from the quick actions menu.

WorkGuru will create a new asset and copy over all fields (including custom fields) except for the unique Serial Number.  Update the new asset's information and click Save.   Note:  Copying an asset does not copy the asset history.