Copy Result of SetFilter to temp table (or other structure)

Hi All

I need to filter sales lines by a number of attributes and make a copy before I update the selected lines. After updating the original; sales lines, I need to compare the updated values with the original ones:

So

                SalesLine.SETRANGE("Document Type", SalesLine."Document Type"::Order);             
                SalesLine.SETRANGE(Type, SalesLine.Type::Item);
                SalesLine.SetFilter("No.", '= %1', SourceItemNo);
                SalesLine.SetFilter("Blanket Order No.", '= %1', BlanketSalesLine."Document No.");
                SalesLine.SetFilter("Blanket Order Line No.", '= %1', BlanketSalesLine."Line No.");
                SalesLine.SetFilter("No.", '= %1', SourceItemNo);
                SalesLine.SetFilter("Quantity Shipped", '= 0');

                // take a copy of these (in a temp table?) - STUCK HERE

                // repeat until over filtered sales lines

                // compare COPY of original lines with data in update lines

How can I make a copy of the filtered lines? (I don't actually need all the fields, but there will only be a max of about 100 records)

Thanks

Mark