I am creating a training document using MS Word 2010 and I want to use an arrow to point to a field on the screenshot and apply a number in a circle that corresponds to a table that describes the field.

I can do the arrow but I don't know how to create the numbered circle. Once the arrow and circle are created, I will group them together for that field. Can anyone provide the how to for the numbered circle

If I understand what you're trying to do, you should be able to right-click the circle and select either Add Text or Edit Text (whichever is available in Word 2010; I'm working with Word 2013 right now) to put the number in there:

_{(click to enlarge)}

You can then adjust the text formatting just as if the circle were a regular text box.

You can use special characters named "Enclosed Alphanumerics". Copy an paste to word.
http://jrgraphix.net/r/Unicode/2460-24FF

There are many ways to achieve that

Use Unicode enclosed characters

The number of different possibilities is limited, but it works

• ①②③④⑤⑥⑦⑧⑨⑩⓪⑪⑫⑬⑭⑮⑯⑰⑱⑲⑳




• ⓵⓶⓷⓸⓹⓺⓻⓼⓽⓾⓿⓫⓬⓭⓮⓯⓰⓱⓲⓳⓴




• ㉑㉒㉓㉔㉕㉖㉗㉘㉙㉚㉛㉜㉝㉞㉟㊱㊲㊳㊴㊵㊶㊷㊸㊹㊺㊻㊼㊽㊾㊿

More about them:

• https://en.wikipedia.org/wiki/Enclosed_Alphanumerics


• https://en.wikipedia.org/wiki/Enclosed_Alphanumeric_Supplement


• https://en.wikipedia.org/wiki/Enclosed_CJK_Letters_and_Months

Use MS Word's built-in enclosing feature

It's included in East Asian Text Formatting Feature and works for at most 2 letters (which is fine for up to 99). If you want to enter arbitrarily long text then insert a shape then edit its text like in hBy2Py's answer

For more information about it and how to enable it if you don't see the button you can read Using the “Combining Enclosing Circle” character in Word

For doing such a task I use Inkscape which is freely available.

1. Draw a circle (F5) (Hold Ctrl and drag)


2. Double-click Fill at the bottom to set the color
   to No paint
   


3. Click on Stroke paint and choose Flat color
   


4. Use 0, 0, 0 for black circle


5. Click on Stroke style and choose a width of 0,5
   mm.


6. Press 3 to center the view on the selected object.


7. Use the Create and edit text objects tool (F8) to write the number


8. Choose a decent font size so the number fits into the circle


9. Use the Select and transform objects tool (F1) to select both the number and the the circle

10. Press Shift+Ctrl+A for the Align and Distribute tool
    Choose Relative to: Last selected. Press Center on vertical axis and Center on horizontal axis.


11. Looking good. Now export this to Word.