About various reports in SAP

As we know SAP provides certain standard reports which we can see thru SAP01 Tcode.

Now if my client wants certain important information about say

" Total inventory of a certain materials in particular storage location of particular plant and GR in same plant for the same material in previous one months period"

If i want extract all hose data from the syatem how can i do it.

As a fuctional consultant what could be my role in the above scenario.

Can ABAPer will help me in this and if so what i need to communicate to him so that he will extract this data for client.

Also can we say that getting above information is nothing but part of LIS .