Hello Naijin:
May I suggest CamBam for Tabs. They have a demo to try before you buy.
After loading CamBam, go to the Help menu at the top right of the page. Open the Help file, and several major sections appear. The second major section is Machining (CAM).
Scroll down this section to the heading "Holding Tabs."
Click on the Holding Tabs heading, and the Tabs description process opens.
The entire process of creating Tabs is explained in clear detail, with graphic pictures of sample code, and several views of types of tabs, including color 3D pictures.
Tabs can be dragged about on your drawing for better placement after they are created, or singly deleted to suit.
I think the effort that went into making and documenting all the CamBam functions is simply superb. There are no cryptic explanations, just clear, detailed, instruction.
CamBam follows a methodology of creating CAM programs from your drawings, and is well worth study to understand how it works.
As they say, a picture is worth a thousand words.
John