drag the Measure field on to work area then add the table calculation then drag the same filed on to work area, now we can see both normal field as well as table calculation field.
1) Drag the [Region] on to row shelf then drag the [Sales] on to text mark shelf.
2) Right click on [Sales] on the work area then click on "Add Quick Tabler Calculation".
3) Drag the [Sales] from measures window to text marks shelf.
4) Go to Show Me" it is located on right top corner. then select "Text Tables".
5) Now view has Sales,% of Sales