help with betting knowledge

First I'd like to say this is really a fantastic forum, I've found tons of useful information and tips and I'm now enjoying sports betting even more

I am a sports betting newbie and I think I am missing lots of technical knowledge here. I have a question about parlay. I do lots of NBA betting and I noticed that certain kinds of parlays posted by forum members are not allowed by many bookies,  

for example:

Parlay 1:

Game1: Lakers vs Wizzards

Handicap: Lakers -10

Total: Under 195

Parlay 2 :

Game1: Lakers vs Wizzards

Handicap: Lakers -10

Game2: Warriors vs Wolves

Handicap: warriors -4.5

I ve noticed that, in many European based bookies like skybet, paddypower, sbobet, I cannot create a parlay like the first. Only the second type of parlay is allowed; that is, I am only allowed to create a parlay that involves multiple games.

I hope I have explained it properly... so question is, how is each parlay called, and why isnt the second type allowed - if the question makes sense?