You can do this in autocad in a few different ways.
I suggest you selecting one of the text items which you wish to align, and then open PROPERTIES.
You will then be able to adjust the justification setting for it. Try MIDDLE CENTER. Press ENTER.
Reposition this text to the desired location, then COPY the x Axis value to your clipboard.
Now select all of the text which you would like to align with it.
In the PROPERTIES you will llikely see their JUSTIFY settings described as VARIES. Change VARIES to MIDDLE CENTER. You could also use JUSTIFYTEXT to change the justification attribute
of a selection of Text object, without moving them, of changing their appearance.
Now that you have changed all of those text items to justify MIDDLE CENTER, all you need to do is PASTE the X Value from your clipboard into the
X Value field in PROPERTIES for that entire group, then press ENTER and they should all be aligned on their centers along a common vertical axis.
You can use the same technique to horizontally align text , of course selecting the appropriate Y axis values.