Strategic Operations and the Alpha Strike Companion have the rules for converting BT units to BF/AS.

Armor is points /30. Damage is /10.

To understand why, you have to start with BattleForce. BattleForce is a direct scaling of BT by 3. Hexes are three times as far across, turns are three times as long. So damage is scaled for being able to fire three times per (BattleForce) turn. Thus, Armor is divided by 3 compared to weapons. The /10 is just to simply numbers.

So a PPC does 10 damage, but it would destroy 30 points of armor over three BT/one BF turn.

Alpha Strike then uses the same stats as BattleForce.