The better way is buy less beans, dump into a small hopper and leave it. You should drink finish it in preferably less than 5 days.
If you are gravely concern, then tape the opening at the nozzle or any openings. If you bought too much, it will still be an issue in anyway, whatever you do.
Not recommended to keep opening and pouring in as this refresh the oxygen in the bag and wherever you pour it.
Even if you keep your beans presumably in vacuum tight condition, there's still oxygen trapped in between the beans. IIRC it's ard 20% for coffee beans.
For cafes, it's pretty easy to control with larger consumption.
Again it's back to talking about getting the right pack sizes that fits the consumption level.
If you are opening a cafe, it is still wise to purchase an additional small grinder. They are useful for your decafs or other not as popular blends.
There are other ways we can do to preserve the coffee, but those are trade secrets.
Grinders are essential but it's more important to buy one that fits your consumption level not buying one with the most features and biggest size.
Just like buying a swimming trunk, you need to get the right size. If the size is too big, it will simply pull you down no matter how advance the fabric is.