NPC's spellls at higher slot

[Jimlock]

Hello,

In combat, how may I have a NPC casting spells at higher slot than the basic one?

[Zacchaeus]

When applying damage click and hold on the damage effect on the CT and then right click to add more dice until you have the correct amount for the level you are casting and then drop that on the target (either on the CT or on the token on the map); or drop it into chat.

[Jimlock]

Thanks !