In the upper right corner, under the Usage sub-module, you can see the functionality to assign SIM Cards to sub-accounts, as well as Products to SIM cards. To assign SIMs and Products, simply select the ICCIDs you want to modify and then click on Assign. 


Under Company select the sub-account where you want to assign SIM cards. In case you want to move a SIM card from one sub-account to another, it is necessary to first assign the ICCID to the main account, and then assign it to the second sub-account. This is a security feature to avoid mistakenly assigning SIM cards from one customer to another.


When you are assigning the ICCID to the sub-account, you can also assign a Product. You will be able to select the products from the Product List that you have previously assigned to the account from the Configuration > Customer Database module.