saamrat
You wanted something for people who are ...
This solution would be more clear to use ...
if dropdown list then
a) they have to find it
b) they have to click it
c) they have to be patient and select
now, there are many possibilities to select wanted 'Customer'...
if ... typing ... 'customer' ... then they have to know 'Customer' that they could see the result.
'Zero's ...
Good 'Customer' should have value with every 'item'!
... then 'Salesman's haven't work 100% ... hmm?
and soon 'Salesmen's would work more and there won't be any more 'zero's!
'Pivot'
I made 'Pivot-table' - You wrote ... no!
Is there windy?