how can i automate mathematic formulas spreading across columns?

[robertomano24]

Hi. I am new here. I don't know exactly where to post this. Hopefully someone can help me.

I have attached an example of what I want to do. Basically, I want each "C" to be subtracted from each corresponding "D" and if applicable, I want each "F" subtracted also for a total "time spent" kind of deal ("F" or breaks don't count as time). I know it would be easy to manually do it in this particular file, but my real file is quite more substantial.

Sorry if this is a noob question. I am a noob. Thanks!

[AlvaroSiza]

I don't think automation is necessary. In say column H, row 2 ("H2") enter:

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.

You can copy this down as far as your actual file data will go.

[robertomano24]

that only does one row. how would i do all of the rows?