How to create a custom bullet with letters (fixed) and numbers (that increment)

Rick,

I'm afraid you can't create your own numbering format including fixed letters in PPT. 

I usually use Word to do the job though, see my blog article: 

Numbering style

To add the letters just click the numbering button in Word, at the bottom click Define new number format. Then click in the number format box, position your cursor in front of the number and type you fixed text. You may need to adjust the indents to fit the text.

You can also insert a Word document into your PPT-presentation using Insert - Object - Microsoft Word document.

You can probably get there with a bit of VBA.  This seems to work, though it might need a few adjustments (color, size and so on).  It won't be quite as simple to undo it once it's done, so test it, make sure it works, then don't use it on your REAL slides until you're sure you won't be changing them again; renumbering would require you to remove what's been added manually.

The text boxes have to be formatted a certain way to begin with; you should be able to do this on your slide master.  See the notes in Sub TestMe.  It's important to select ALL the text in the text box before setting the indents/tab.  This shows what the ruler should look like:

First line indent all the way to the left,

Second line indent and first tab indented however much you like but at the same position

Option Explicit

Sub TestMe()

'   Select the text box that needs special bullets

'   then run this TestMe subroutine (press F5)

'   The text should have bullets set to NONE

'   There should be a second line indent and a left tab set to the same

'   place on the ruler, else it won't work

Dim oSh As Shape

Set oSh = ActiveWindow.Selection.ShapeRange(1)

Call BulletizeMe(oSh)

End Sub

Sub BulletizeMe(oSh As Shape)

Dim x As Long

With oSh

For x = 1 To .TextFrame.TextRange.Paragraphs.Count

With .TextFrame2

With .TextRange.Paragraphs(x)

.Characters.Text = "LO" & CStr(x) & vbTab & Left$(.Text, Len(.Text) - 1)

With .Characters(1, 3).Font

.Name = "Rockwell"

.Fill.ForeColor.RGB = RGB(0, 127, 0)

End With

With .Characters(1, 2).Font

.Smallcaps = True

' and because setting Smallcaps on Rockwell seems to

' have no effect, you might also want to uncomment

' the following, which shrinks it to 80% of it's former self

.Size = .Size * 0.8

End With

End With    ' textrange

End With    ' textframe

Next    ' paragraph

End With    ' Shape

End Sub

Thanks for the bad news. Unfortunately when I try to access your blog it says I do not have permission.

It's really unfortunate that Word and Ppt aren't more interchangeable. Bringing the Word Doc into Ppt is not a real smooth solution as the formatting is going to take some experimentation to make it look like the rest of my Ppt slides. Cheers.

Refer to Steve's suggestions from the link and check if it helps. 

http://answers.microsoft.com/en-us/office/forum/office_2010-powerpoint/powerpoint-multi-level-list-in-tables/dcd7627e-2f95-4413-be3b-2fda96eb7c4d