Dynamic Excel Template Upload

Hi Gurus,

I have an requirement to upload excel with dynamic template from abap program i.e..the excel template won't be a constant, it might change.

For example,

the field positions may change (some customer name in 1st column & sometimes in 5th column),

the number of columns of the excel may change ( some times fewer & sometimes same as the sap table to be uploaded ),

here my difficulty is, how can i map the fields and their respective values from excel to internal table, from there to database table.

Thanks in advance .