So just to be sure:
When the Pledge Manager opens for my level, I'll go in, confirm my pledge level, and select the various options that are included in that level(Star boxes, coins, etc). Then I'll select any add-ons that I intended to get when I pledged more money than the actual pledge level. Then I'll check out, select my shipping wave options, and pay my shipping. In theory, at this point I am finished and can settle in for a nice few months of obsessively refreshing my email until a shipping notice shows up.
However, if I at some point scrape together some more cash and decide to select a few more add-ons, I will have to remember to reselect every option I chose the first time around in addition to the new add-ons, though I will only have to pay more money for the new stuff. I can repeat this process as many times as I wish, up until the Pledge Manager closes.
Is that correct?