Use the select option to only select the point you are applying the load .

By trying to apply second load, the first one automatically deleted.

You better take the meshed model to hypermesh, there you can apply multiple loads very easly

Setting the heat load in the form of a predetermined temperature or inhomogeneous temperature field leads to the neglect of other types of thermal loads. And it is a natural consequence. But if consistently boundary conditions of the second and third kind are defined, then they are considered as a superposition.

Pl. explain in details....

Try using surface/contact elements, It duplicates the nodes, and can take another type of load on the contact element while the main element has another type of loading, However, i am wondering how can it be in reality you have two different types of loading on a single spot?