Hi experts Please explain me how to go with this?

Hi experts

My client is asking that following scenario how to go with this?

Example:

Purchase order Order lot unit is Barrel its contains 200 litr

When the requirement lies up-to 220,420,620,820 it should select the 200,400,600,800

when the requirement exceeds 221,421,621 and 821 it should select the next barrel like 400,600,800,1000 Ltr

I tried in Rounding profile in in OWD1 (Static/Dynamic)