I would like to setup a slider for my markup %, so when I change my slider on a particular product in the table it will show the impact on my net profit.
No, inline sliders aren't possible. You could set up four sliders using four variables and use an if-statement in your chart expression to pick the variable that goes with the product.
Or perhaps you could define Markup % as an input field in the script. That allows you to change the values in the Markup % field in the chart directly.
