Q.Canna bulbs and Dahlia
I was just given many cana bulbs to plant in spring
Thinking of putting them in a containe
With dahlias?
Will this work?

Canna bulbs and dahlias can indeed be grown in pots. See these articles for information:
https://www.gardeningknowhow.com/ornamental/bulbs/canna/planting-cannas-in-pots.htm
https://www.gardeningknowhow.com/ornamental/bulbs/dahlia/grow-dahlias-in-containers.htm
To grow them together, just make sure the pot is large enough to accomodate the mature size of both plants, and they should do well.