I have partly decided this problem by a bit another way, I made and input an attribute "Acc_cost" at the source and destination account, but at destination I input complicated value for this attribute which consist of couples of values - the source account name and the value for driver quantity. In a driver formula I use the costuction based on if and find operators: ...find ( Source."Acc_cost", Destination."Acc_cost")... but there are some limitations in this way 1. For the Find, Len, Mid functions there is 63 characters limit for arguments. It is very sad but may be it is increase the speed and performance. 2. 1025 character limit for use in a driver formula. So I can only assign 15-20 different values for DrvQtyCalc. And than I have to make another driver and it is a bit inconvenient.
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