Altium Designer has had the ability for a while to create a text frame in order to create blocks of text such as fab notes. CS does not have this function and bringing in an image of text just doesn't cut it.
The method I'm showing here has been tested and works well with two caveats that I know of:
1. After you have entered your multi line text in AutoCad or clone, select it all and remove all formatting. If you let the software number the lines, there are hidden characters in front of each line which mess with the dxf import to CS.
2. CS seems to process a series of tabs as if it were a series of new line characters. The solution here is to use spaces. Remove ALL tabs in your text.
In order to deal with caveat #2, I use a Truetype mono spaced font such as Bitstream Vera Sans Mono. It's also very handy if you're into programming.
Create and Import your block of text
1. create your multi line text block in AutoCad or a good 2D clone. I've found CMS Intellicad to be very good and there are several others.
2. set the text height to 0.200" for starters, then select all the text and REMOVE ALL FORMATTING
I believe the lead in characters confuse CS dxf import function
3. save your file, then export it to dxf (I used 2013 dxf ascii)
4. in CS, select the layer you want to place the text on
5. in CS, import the dxf, at the CS "Import from Autocad" dialogue box, enter 1000 at 1 Autocad unit = 1000
6. if the text falls off your working space, increase your board size and do over
7. At this point, the text will look like a vector font and quite large
8. Select all the text lines you just imported
9. In the object inspector, change the Text Kind to TrueType font and change the TrueType Font Name to Bitstream Vera Sans Mono. Change the layer also if you need to.
My experience after many hours of putzing around with this, the method appears to deliver nicely spaced, good looking text. If you need to edit it, go back to your AutoCad (or clone) and do it there or for simple change, each line is a normal CS text string which you can edit.
For our friends around the world, hopefully you just need to find a mono spaced font for your language for equivalent results.
The import process becomes simple after a few times but I find that it helps to write this stuff down in my CS notebook 