Import Excel multiple worksheets to Internal tables

I am running SAP CRM ABAP 6.0 and I need to provide a program for uploading a spreadsheet with multiple worksheets into CRM.

SAP being SAP does not provide the same function modules in CRM as are available in ECC...

I am over the initial hurdle using F4_DXFILENAME_TOPRECURSION to load the file from either the presentation server or application server...

however, none of the standard FMs are available to convert the spreadsheet into internal tables...

I wonder if anyone has successfully done this and can point me to another function module!

I did try and recreate the TEXT_CONVERT_XLS_TO_SAP but was unsuccessful due to missing type pools.....