As a quick experiment, I created a new person in a new file. This new person was entered in as a female named Nancy Newman with a year of birth of 1846 in Indiana and a year of death of 1923 in Illinois. Her husband of Riley Rampley was entered. That was it.
Doing so brought up the boxes as shown below. I decided that I did not need the alternate for Nancy from 1900 as I always use maiden names and the 1900 enumeration uses her married name. I do wish that the name could be separated into the last name and the "rest" so that alternate first names could easily be recorded.
The 1900 residence information was completely new for my file, so adding it and the source was not really a big deal.
The birth was more problematic.
If I simply add the 1900 as a source for the 1846 year of birth then I will be implying that the 1900 census indicated Nancy was born in 1846 in Indiana. That's not what the census says. Ancestry.com easily allows me to do this. In this case, I want an alternate fact and add the source. That's NOT how the screen below is set up.(click on the image to view larger)
We'll discuss additional issues in future blog posts on this topic.