Just a quick question: (I have Googled it)
...Is it possible to move entities from Portal 2 (hammer), such as prop_weighted_cube, into Portal(hammer)? If so, can anyone instruct me?

...I want to know this because I have been attempting to make maps with Portal, but it gets frustrating when I am not used to having to create multiple entities for something (whether it be props, triggers, or anything else)

Sadly, no, for the average user it is not possible.
It's only possible if you have portal 1's leaked source files, and even then it's probably a risky legal issue to modify and distribute those.

Okay, thanks for the information.