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3D formulas are **simpler** than regular formulas, **take less time to create** than regular formulas and are **less prone to errors**. What’s not to like?

For example, let’s say you need to create a summary sheet which will calculate the total monthly figures for the six months between January and June.

Here is a snapshot of the 6 monthly worksheets, name Jan, Feb, Mar, Apr, May and Jun.

You’ll notice that each sheet has exactly the same format and it’s showing the total sales for 4 Australian states.

What most people would do, and it’s actually the longest and the slowest way of doing things, is to start a formula in cell B2 like:

=SUM(

then go to each month’s worksheet in turn and click cell B2 and separating each cell reference with a comma. Add the closing bracket at the end and you finish with this formula:

=SUM(Jan!B2, Feb!B2, Mar!B2, Apr!B2, May!B2, Jun!B2)

It works. But imagine you had 20 sheets to process, rather than just 6! You would spend half the day collecting cell references and you would probably make a mistake or two along the way!

Here’s a smarter way to get the job done.

Start the formula in the same way.

=SUM(

then …

- Click the Jan sheet to select it.
- Hold down the SHIFT key.
- Click the Jun sheet. Every sheet between Jan and Jun is now selected.
- Click cell
**B2**. - Type a closing bracket.
- Don’t press Enter just yet. There is one final step you must do.

At this point your formula will look like this:

=SUM(Jan:Jun!$B$2)

The cell reference is absolute (which means ‘fixed’). That’s what the dollar signs in the formula do.

To enable us to AutoFill the formula to the rest of the table, we must first make the cell reference ‘relative’ (‘unfixed’) by removing the dollar signs. One way is to manually delete the dollar signs but you can also tap the **F4** key 3 times until the dollar signs are gone.

The formula is now:

=SUM(Jan:Jun!B2)

This means that when we AutoFill down, the cell beneath will say

=SUM(Jan:Jun!B3)

and the cell beneath that

=SUM(Jan:Jun!B4)

and so on.

Now that the formula in cell B2 is relative, you can AutoFill down to copy the formula.

Most people stop there. But one quick thing I want to mention here is that AutoFill copies any manual formatting as well as the formulas, so at some later stage you may have to come back to fix the formatting.

Good news! It doesn’t have to be that way.

As soon as you do the AutoFill, click the **AutoFill Options** smart icon (which appears on the bottom right corner of the selected cells) and choose Fill Without Formatting.

When you choose **Fill Without Formatting** it's like telling Excel “just copy my formulas down but don’t touch my formatting”.

**TIP**: If you have used the ‘Format As Table’ feature, you won’t have any issues with using AutoFill because Excel takes care of all the formatting for you.

So there you have it. 3D formulas. Easy to set up. Go get ’em.

Did this clear something up for you? If so, please share on your socials and/or post a brief comment below.

Likewise, if something didn't make sense or you have a question, pop it into the comments below. I'll be waiting ...

Cheers. Here's to your learning and success. Enjoy the rest of your day.

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