How to convert multiple leads at one company/account into 1 Opportunity/1 Account/Multiple Contacts

Hi:

I’m trying to convert multiple leads at one company/account into 1 Opportunity/1 Account/Multiple Contacts. I see that I can convert 1 lead to an Opportunity and create an Account, then separately convert each or the other leads to a Contact at the Account, but this will be quite time consuming. Is there a way to do it in one operation/in bulk? I see that I can merge multiple leads into one, but it looks like I need to select one lead for the resultant merge and I will lose contact info. for the other leads.

Thanks very much for any input!