Hi, I'm new here and just starting out so apologise if this seems like a remedial question,

I currently have a custom object for subscription packages (Subscription_Type__c) within the subscription there is a field that details the cost of the subscription (Estimated_Monthly_Cost__c). I want my users to be able to add mutiple subscriptions and the oppertunities amount field (Amount) automatically total all the subsriptions thus giving me a total income for an oppertunity?

Thanks for any help,

Mike