When you add Product X in Megaventory (or afterwards when you edit it), you can define its Default Sales Price. Let's say this is 100 USD per item. You now need to make 3 sales pricing rules.
To do this, click on the Pricing Rules module in the menu and select New Sales Pricing Rule:
1. Enter a name, eg Sales Rule Tier 1
- Set the Base Price to be the Default Sales Price,
- Set Use this Pricing Rule for Specific Products (pick Product X),
- Click at Insert
2. Enter another name, eg Sales Rule Tier 2
- Set the Base Price to be the Default Sales Price,
- Set Percent on Base Price at -50%,
- Set Use this Pricing Rule for Specific Products (pick Product X),
- Check the Valid for a specific quantity range box,
- Enter Minimum = 11 and Maximum = 50,
- Click at Insert.
3. Enter yet another name, eg Sales Rule Tier 3
- Set the Base Price to be the Default Sales Price,
- Set Percent on Base Price at -90%,
- Set Use this Pricing Rule for Specific Products (pick Product X),
- Check the Valid for a specific quantity range box,
- Enter Minimum = 51 and Maximum = 100000,
- Click at Insert.
Now whenever you create a Sales Order for Product X, the Pricing Rule corresponding to the quantity you're selling will come into effect and automatically apply the correct price (100, 50 or 10 USD).