How to create measurement points on a PCB for diagnostics?
There are multiple ways to deal with adding testability features to a board. These will work in any CAD package designed for PCB Schematics and Artwork.


First step is to define a schematic symbol to represent a one pin device called a test point.
Place an instance of the designed test point symbol on the schematic and then connect to the a desired circuit node. You can use named node connections or use the schematic connection lines. Repeat for all nodes needing testability access.
Produce a net list from the schematic so that it includes the test points as designed into the schematic.
Design a layout symbol that is a single pin component that will be your test point component. Here is where some variation can come into play. 
(A) use an SMT pad for a test point. Advantage is that they only take space on one side of the board.
(B) use a ThruHole pad with suitable sized plated hole. One advantage of a through hole pad is that it can make it easier to poke a multimeter probe in place.
(C) use a larger ThruHole pad with a hole big enough to accommodate a grabber or scope probe hook. These would be place close to the edge of the board so that it is easy to connect to.
(D) make a footprint for an actual commercial test point component that gets mounted on the board. The footprint could be SMT or THMT depending upon the type of test point you choose. The key advantage of this type of test point is that a grabber probe can be placed and will stay connected during your measurement process. The disadvantage is the added BOM content and incremental component cost.
When placing components on the board include the test point component just like any other component. 
When you import the net list into the layout the connection of the test points by reference designator will be attached to the desired circuit nodes.
Move the test point into the desired position and then simply route a trace connection to target component lead.


SMT PAD Test Points



When using SMT pads for scope probing it can be beneficial to locate adjacent GND pads nearby so that the ground reference of the scope can be as short as possible. There are available scope probe GND leads that look like the following picture and made so they are flexible but hold shape. Plan the SMT pads accordingly.



Through Hole Test Point Idea



Test Point Component Usage



Sometimes it may be desirable to use a specialty test point component that allows for direct plug of a scope probe. These are typically a two part assembly that has a center socket pin and and a separate three or four legged ground clip.