Is it possible to just add a part of market package?

So i am new to unreal and i am struggling with adding materials.

When i add a material package from market i get like hundreds of materials and it makes my project HUGE and also it takes a while to load. Is there a way i only add a special material of that package? Also is there a way to see the actual material ?

You have to load the whole pack. Then auditon it and make a note of the materials you like, then bin the rest ( from inside the content brower! ).

Having a large amount of assets in your vault wont make any difference to project speed ( unless the hard drive on you pc is filling up ).