Margin is the amount of money that is required by the company to hold a position. Margin requirements are set by the exchange and differ by product.
As a company administrator, you can configure margin limits per company for each product and product type, with the exception of inter-product spreads/strategies that have legs in more than one product or product type. For those, margin is only calculated for each outright product and not for the entire spread.
Note: A percentage of the product margin can be applied per product when setting pre-trade risk limits for an account.
To configure margin limits per company, use the Company Settings | Product Margin tab in the left navigation pane.