Assigning Vans

[Katrix1982]

Hi,
I have to assign vans to my employees every morning. Each employee has a preference of which Van they want to use. Currently I am doing this by hand and comparing a sheet with employees and preferred van and trying to assign them to their van. I have 50 employees but 20 vans, so all 50 employees have a van preference from 1 to 20, repeated as needed. If it was 20 vans and 20 employees I would just use Vlookup to assign the vans. With 50 employees and 2 employees with same preference working the same day I am not sure how I can accomplish this.

I have a 3 sheets, one sheet (Vans) has van numbers 1 to 20. Second sheet has (Employees 50-75 with a preferred van number). I want to know if there is a way I can make it so that if an employee name is added to a (Blank) third sheet it would do a Vlookup to see which van the employee prefers, but if the Van is already assigned to another employee, it would pick another unassigned van for the employee.

I can get van preferences from employees where they pick 1st 2nd 3rd 4th 5th preferred van if needed.

Is there a way to do this in Excel?

Thanks.