Currently the product does not support storing multiple product key for single license. However, there is a work around available to achieve this.
• Let say the product P which has multiple key (K1, K2, K3).
• Create a base license for P with key K1.
• Create an upgrade license with P with key as K2 and map the previous one as base license.
• Repeat the same for K3 as well. Make sure to give same license quantity in all license which is the total license procured.