National conventions are part of which step or me preektential process *

If you're asking about the presidental process it starts off with the basics.

-Have to be over the age of 35.

-be a US citizen

the convention is ...

the national conventions have been mostly ceremonial, simply ratifying the candidate who has secured the support of a majority of delegates. They are  organized for like media events to talk about and highlight the presidential and vp nomines, the party leaders etc. For the next few days they do speeches, and talk about what their campaign and policy platforms.

Explanation:

the installment plan of the 1920s, an arrangement that allowed people to buy what they wanted with a small down payment and pay off the rest in monthly installments, provided americans a way to own what they did not have the money to buy.