Is there a way to include strings in a command?

When I say including strings in a command, I mean a command in which the player executing the command has to provide extra information. An example would be /effect, in which you have the base command (/effect), the target player, the effect to give, the duration of the effect, and the strength of the effect, or /effect (player) (effect) (duration) (strength). Is there a way to do something similar in MCreator?