You are able to add multiple products to an opportunity, but you they will need to be similar. For example, one software product may have several different modules. These can all be added to the same opportunity. If you have product types that are very different, create a new opportunity.
Also, if there is a chance the client is not going to go ahead with one element, it’s best to create a separate opportunity. When an opp is Closed as Won, all products will be taken over and it’s easier to close a separate opp if it doesn’t go ahead.
