How Set dynamic dataports in code

I have two different dataport, both import data to the same tables but in different way.

In loop for customer I call up function to import data.
In this moment I have two function, they are almost identically but the variable signed to dataport is different.
Code for loop looks like:

CustomerRec.Reset;
If CustomerRec.FIND('-') THEN BEGIN
REPEAT

IF CustomerRec.CustomerNo = 1 THEN
ImportDataFunction(CustomerRec);
IF CustomerRec.CustomerNo = 2 THEN
ImportDataFunction2(CustomerRec);

UNTIL CustomerRec.NEXT=0;
END;

Code in both function (ImportDataFunction AND ImportDataFunction2) looks that:

Name DataType Subtype Length
ImportDataportVariable Dataport Import_data
ret Integer


EXISTS('FilePath');
ret := SHELL('FilePath',
Rec."Error Directory", Rec."Output Directory", '_list.txt');


IF EXISTS(CustRec."Output Directory" + '\_list.txt') THEN BEGIN
ImportDataportVariable.IMPORT := TRUE;
ImportDataportVariable.FILENAME := CustRec."Output Directory" + '\_list.txt';
ImportDataportVariable.SetCustomer(CustRec."Customer Name");
ImportDataportVariable.RUN();
IF EXISTS(CustRec."Output Directory" + '\_list.txt') THEN
ERASE(CustRec."Output Directory" + '\_list.txt')
END;

In second function I have changed only variable ImportDataportVariable to different dataport.


Now I wont create only one function instead of two.
I have table with settings where I set for each I need Customer, specific dataport. That In loop for concrete customer I know which dataport I must use.
But unfortunetly I have know idea :-k how do that, in my function, that the variable Import_data should be dynamic change??

Do you have idea for that ?? Thanks