Yes you can, however in order to do so you must add them as an additional confirming party in your Showing Robot Settings for the listing. In your Showing Robot Settings under "Robot Confirmation Instructions", add another party by selecting the "Add Confirming Party/Contact" button and then fill out the additional party's contact information. You can have as many additional confirming parties as needed.
Please note that under "Role" you may need to select a category other than seller for additional confirming parties even if they are a seller. The reason for this is because the seller role specifically pulls whatever information is set up in your Seller Details for that listing. Generally we advise using the "other" designation for additional sellers.