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Automating text based on information in other column
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What Kris is implying is that once someone enters data manually into column B, there is no going back to the formula  it is overwritten by the data entered manually.
You might consider entering data in column C.
=if([column A]23 = "True","",[column C]23)
will show in column B (where the formula resides on row 23) blank if column A is "True" and will show the value of column C if not (if anything else)
Craig

Thanks Craig and Kris. That makes sense. Could you help me understand that with an example, using fake info below?
Column A = Campaign (Theme)
Column B = ID
If Campaign (Theme) is true, than ID = 123
Also, where do you put the formula? Right in the column?

Hi Erica!
For the example you gave, you would put the formula in every cell in Column B. So the very first cell of column B should look like this:
=IF([Campaign (Theme)]1 = "True", "123", "")
This will set Column B to a value of "123" if the Campaign column is true, or blank if the Campiagn column is anything else. When you copy and paste this formula into other cells, the number should update accordingly. The second cell will automatically change to =IF([Campaign (Theme)]2 = "True", "123", "").

It worked!! Thanks. One last question...well two Can I do an or??
Case 1:
Column A = Site
Column B = ID
If Site is Google or Yahoo, than ID = 123
Case 2:
Column A = Site
Column B = ID
If Site is Google, than ID = 123 and if site is Yahoo, than ID = 456

Absolutely! Although your two questions have pretty different answers.
For question 1: That's what the "OR" function is for (although the format of the formula isn't necessarily intuitive). This time, your column B would look like this:
=IF(OR(Site1="Google", Site1="Yahoo"), "123", "")
You can put as many logical tests as you want inside the OR function. There's also an AND function that works in a similar way, but it only returns true if every test returns true.
For question 2: You'll have to use nested ifstatemets to accomplish this. Your formula in Column B would look like:
=IF(Site1="Google", "123", IF(Site1="Yahoo", "456", ""))
Basically, you're telling the column to go through a few steps:
1. Is the Site equal to Google? If it is, put "123". If it isn't, go to step 2.
2. Is the Site equal to Yahoo? If it is, put "456", If it isn't, leave this blank.
You could extend this chain of Ifstatements as long as you want! There's a more detailed tutorial here: https://www.smartsheet.com/blog/supporttipbuildnestedIF
I hope that helps!

What do you want the column B value to be if column A is False?

Great answer Greg.
Craig