multi sheet lookup with multiple results

[Alec H]

Hi,

I am trying (unsuccessfully) to create a lookup sheet in a workbook. The data that the user will lookup is stored on 2 sheets within the workbook. They are;

1 - A Customer List that simply lists Company Name, Address, contact details etc.

2 - An enquiry List that lists any enquiries recieved from customers.

There is a common field in the 2 lists of a unique customer number.

I have encountered 2 problems that are confusing me at the moment.

Problem 1 - How do I create a dropdown list on my new lookup sheet that shows The Company name (the way that a user will search) on a different sheet to the data? If I try and use Validation/List it tells me that the list has to be on the same sheet as the lookup cell.

Problem 2 - Once the correct customer has been selected how do I get a list of all enquiries (there may be several) relating to them to appear on the lookup sheet. I have been dabbling with vlookup but without much success...

Please see my attachment for reference