1. No, you cannot reference cell values in other objects. Only an expression can calculate that value. So you need to reuse the same expression.
2. No, a total row (or any row) cannot be copied. QV is not a spreadsheet. You can change the label of the total. You can also create a calculated dimension to show any values you want with the valuelist function. For example =valuelist('Head & Shoulder'). Your expression would then be something like =if(valuelist('Head & Shoulder')='Head & Shoulder', sum(price)). Replace sum(price) with whatever expression that calculates the value you want.