Replacing Filtered Data with Concatenated Results

Hi,

I'm new to using functions in excel, and I'm having trouble with what I believe should be a simple fix.

I have a pre-populated excel report which populates information in several columns. Think of it like this:

F--------G-------H----------------I
1 This is a sample of what I'm dealing with
2 There are up to hundreds of rows of information
3 I only need about twenty to actually show up
4 This is the row I will use as a sample

First, I use the filter to get rid of unneeded rows (in this case 1-3). I do not need the other text at all, it could be deleted.

Then, I need to concatenate the info, so I use the formula =CONCATENATE($F1, " ", $G1, " ", $H1, " ", $I1), and copy it to an entire column, creating this:

F------G-------H----------------I-------------------------K
4 This is the row I will use as a sample --------------------- This is the row I will use as a sample


So now, I want to replace the original information with the concatenated information. This is the formula I tried: = REPLACE($F2 & $G2 &$H2 & $I2, 1, 1024, $K2)

It populates the concatenated info to the cell in which I placed the formula and does not replace the info in the other cells. [Edit]: I should explain that I did 1024 because that was the maximum number of letters populated per cell.

I'm hoping someone on this forum could help me learn how to fix this. I am trying to learn about functions, so I don't want just the answer. I'd like to learn from my mistakes!

Thank you!