Note: Purchasing Formulas are applied in a hierarchical manner. If more than one formula applies to a purchase order, then Inform ERP applies them according to a preconfigured hierarchy. See How multiple price formulas are assigned to a single order.

- Go to Purchasing > Purchasing Matrix.
- Choose whether this formula will apply immediately or some time in the future: from the Type list, choose Current or Future.
- From the Show list, choose whether you want to see Available, Existing (ones that have been created and are in use) or Expired (ones that have been created, but are no longer used) Formulas.
- Choose the Branch in which you want the formula to apply, or leave blank to apply to all branches.
- Type the Vendor name or number to which the formula applies. For Purchasing Matrix formulas, you will likely always choose a specific vendor.
- Under the Product Filters, choose at what levels you want to assign the purchasing formula. For example, enter the Product Line and the Price Group to set a price formula for a group of products within a Product Line that belong to a specific Price Group.
- ProductA product's reference code. If you set a price formula by product number, then it is applied only when that product is purchased.
- Product LineA product line's reference code. If you set a price formula by product line, then it is applied to all products within that product line.
- Price Group A price group's reference code. If you set a price formula by price group, then it is applied to all products within that price group.
- Buy Line The reference code assigned to a Buy Line. A price formula set for a Buy Line applies to all products that belong to that Buy Line.
- Then click Search.
- Click the combination to which you want to assign a formula.
- On the Purchasing Formula pop-up that appears, specify the details for this combination. Note that this procedure describes setting only basic formula options; For help calculating other formulas using a Gross Profit Percentage, Multiplier, or Chain Discount, see the Advanced price formula options.
- If this is a new formula, then the first line will specify a Quantity of 1. You must set the price formula for single product before specifying multiple products.
- Choose whether to base the formula on Cost price, List price, or Net price. You can check these values in the Product Master. For example, select L1 to give a discount off the list price or select C1 to create a mark up on cost. Choose your base field and the press the Tab key.
- From the %/$ list. choose whether to apply the price formula based on a percentage of the cost or a fixed dollar amount. Press the Tab key.
- In the -/+ box, choose whether you want the formula to add or subtract from the base price, and then press the Tab key.
- In the Amount box, type the percentage or dollar amount that will be added to or subtracted from the base amount. Note that for percentages you do not need to enter the decimal equivalent.
- Quantity: 1
- Price C/L/N: L1
- %/$: %
- Amount: 10
- Click Save.

Under Purchasing Matrix Results, you will see all of the available and existing pricing combinations for the parameters you entered. Blue combinations do not have any current price formulas entered. Green combinations have at least one current price formula entered, although you may edit the formula or add additional formulas for the combination.

The formula is effective immediately, unless you specified a different effective date.