Excess applies
The basic policy of the DOD PMRP is to
A personal liability, or umbrella, policy pays liability limits above those you can get on your homeowners or other basic liability policy. If you are thinking of buying a personal liability policy, begin by finding out the maximum amount of personal liability your homeowners policy provides. Make sure you coordinate the liability limits so that the umbrella policy covers any liability claim in excess of the amount your basic policy will pay, up to the maximum limits of the policy.
An excess insurance policy is one, the coverage of which, sits "atop" the primary policy. That is, the excess policy provides additional indemnity benefits if or when the primary policy limits are exhausted. In general, the primary insurer has a duty to settle a claim within its policy limits if it is possible to do so so as not to subject the excess policy to exposure. Normally, the excess insurer will track the underlying litigation to ensure that this is done. It may have a cause of action against the primary insurer if the primary insurer does not do this and the excess insurer is called upon to pay the claimant.
Incremental funding policy
similar - umbrella usually a personal lines excess coverage. excess liability policy could be anything. Both are designed to provide another layer of protection over and above the underlying policy(ies)
Excess liability insurance gives you extra asset protection beyond your basic policy. It can help in the event of being sued by someone due to injury or negligence in your home or anywhere else.
Full funding
I believe the term you are meaning to say is excess liability coverage. An excess liability policy act similar to an Umbrella policy that increases your liability limits on your underlying auto, home, boat, or rv policies at a very reasonable rate. An excess liability policy does differ from a true Umbrella policy so ask your agent to explain the differences and what is available for you.
The excess is what the policy holder has to pay before the insurance company starts to pay. If excess is $100 Damage is $300 the policy holder gets $200.
Full funding
policy