Does the UA Beast Conclave revised ranger let you add your proficiency bonus to both the Boar companion's Tusk damage roll and its Charge damage roll?

Question

I am just hoping to get some clarification on this one.

The UA Ranger Beast Conclave's Companion's Bond feature says:

In addition to the areas where it normally uses its proficiency bonus, an animal companion also adds its proficiency bonus to its AC and to its damage rolls.

Does this mean if my boar companion uses a charge attack, I add proficiency damage twice (to the tusk damage and charge damage) or is it added only one time?

Just for referencing, the boar's statblock says:

Charge. If the boar moves at least 20 ft. straight toward a target and then hits it with a tusk attack on the same turn, the target takes an extra 3 (1d6) slashing damage. If the target is a creature, it must succeed on a DC 11 Strength saving throw or be knocked prone.

Tusk. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) slashing damage.

Answer 1

You would only add the proficiency bonus one time.

As you have mentioned in your question:

In addition to the areas where it normally uses its proficiency bonus, an animal companion also adds its proficiency bonus to its AC and to its damage rolls.

This means that when you roll for damage on an attack for your animal companion, you would add its proficiency bonus as a flat modifier to the total damage dealt. In the case of the charge attack, you are still only making one attack (the charge attack is an augmented tusk attack that does more damage) and thus would only add the proficiency bonus once.

Though keep in mind that you add this bonus for each attack made by your animal companion; it is not bound by any once on your turn limits.