You may split customer line items based on material division through user exits. Better to discuss with SD consultant further information.
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You have available some notes during the interfacing SD and FI. See Note 301077 - User exits for the interface to accounting.
For a sample where you can use these enhancements see Note 611040 - Down payment invoice for Italy, related with coding of include ZXVVFU08 and how it adds lines in XACCIT.
It is possible in include LFACIF57 subroutine FI_DOCUMENT_POST
Create implicit enhancement and change XBSEG table data. That will reflect in actual posting.
Regards
Mani Kumar