Only vendors can declare their Intent to Bid (ITB), buyers do not have the ability to do this on their behalf.
If a vendor has interest externally but the ITB deadline has passed, you can always extend the ITB deadline.
You can this by following the steps below:
1. Go to Edit Schedule from the Actions button:
2. You can extend the due date for Intend to Bid only:
This way the overall timeline for the Project will remain the same.