Define Search String for Electronic Bank Statement in S4C

Dear Expert, The need is: When importing an electronic bank statement, we want that the system identifies the business transactions and uses the settings that we have already made to determine how each should be recorded. it’s possible to look for a string in order to assign a Posting rule in S4C ? How can we manage the functionalityDefine Search String for Electronic Bank Statement in S4C? Best Regards, Karim