The word subes is the present form of subir in the second person singular.
See the full subir conjugation

subir

Frederica, ¿por qué no subes y tocas una pieza?
Frederica, why don't you go upstairs and play a piece?
¿Por qué no subes y reservas una sala de conferencias?
Why don't you go upstairs and book a conference room?
Así que, ¿por qué no subes a terminar tu tarea?
So why don't you go upstairs and finish your homework?
Si es verdad, ¿por qué no subes y lo arrestas?
If that's true, why don't you go upstairs and arrest him?
Entonces ¿por qué no subes y hablas con él?
Then why don't you go upstairs and talk to him?
¿Por qué no subes y ayudas a Bunchy con las cajas?
Why don't you go upstairs, help Bunchy with the boxes?
Es tu idea, te subes a esa cosa.
This is your idea, you get up on that thing.
¿Por qué no subes a la furgoneta y nos ayudas?
Why don't you come{\ to the van and} helping us?
¿Por qué no subes con tu padre, Zoe?
Why don't you go upstairs with your father, Zoe?
¿Por qué no subes y te metes en la cama?
Why don't you go upstairs and get in bed?
Cariño, ¿por qué no subes a tu habitación un minuto?
Sweetheart, why don't you go up to your room for a minute?
¿Por qué no subes y te preparas para dormir, sí?
Why don't you head upstairs, get ready for bed, yeah?
¿Por qué no subes y calientas la cama?
Why don't you go upstairs and warm up the bed?
Olivia, ¿por qué no subes y terminas de ver tu programa?
Olivia, why don't you go upstairs and finish watching your show?
¿Por qué no subes y esperas en la habitación?
Why don't you just go upstairs and wait in the room?
La única pregunta es que si subes a bordo.
The only question is whether you get on board.
¿Por qué no subes con Becca a tu cuarto?
Why don't you and Becca go up to your room?
¿Por qué no subes a calentar la cama?
Why don't you go upstairs and warm up the bed?
¿Por qué no subes y desempacas tus cosas?
Why don't you just go upstairs and unpack your stuff?
¿Por qué no subes a tu carro y vienes a verme?
Why don't you hop in your car, come see me?
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