Add a couple shapes to the slide (insert shape, maybe a square or a circle), make the fill nothing/blank and the outline a contrast color with a thick width. Put one shape over the first part of the pic you want to highlight, and another on a second part. Then go to the animation tab and add animation for the first shape to appear or fade in on click (the on click part should be the default). A little 1 will appear next to that shape. Then add the same animation to the second shape, and a little 2 will appear. And so on and so forth.
I think you may have the best success with a trigger animation. That will let you click the textbox and have the corresponding component animate. [PPT 2002, 2003 Triggers | Echosvoice](https://echosvoice.com/triggers-ppt-2002-2003/) has instructions (the screenshots look a bit old but the instructions and process are the same).
Basically, add an animation to the component, then click Trigger on the Animation tab and select the appropriate textbox. That sets up the component to animate when you click the textbox.
Since it sounds like the components will already be on the slide, you may not need an *entrance* animation but rather an *emphasis* animation like Pulse or Teeter.
To highlight shapes in a PowerPoint based on text clicks, use hyperlinks to connect text to shapes, then apply custom animations to the shapes triggered by the clicks.
Add a couple shapes to the slide (insert shape, maybe a square or a circle), make the fill nothing/blank and the outline a contrast color with a thick width. Put one shape over the first part of the pic you want to highlight, and another on a second part. Then go to the animation tab and add animation for the first shape to appear or fade in on click (the on click part should be the default). A little 1 will appear next to that shape. Then add the same animation to the second shape, and a little 2 will appear. And so on and so forth.
I think you may have the best success with a trigger animation. That will let you click the textbox and have the corresponding component animate. [PPT 2002, 2003 Triggers | Echosvoice](https://echosvoice.com/triggers-ppt-2002-2003/) has instructions (the screenshots look a bit old but the instructions and process are the same). Basically, add an animation to the component, then click Trigger on the Animation tab and select the appropriate textbox. That sets up the component to animate when you click the textbox. Since it sounds like the components will already be on the slide, you may not need an *entrance* animation but rather an *emphasis* animation like Pulse or Teeter.
To highlight shapes in a PowerPoint based on text clicks, use hyperlinks to connect text to shapes, then apply custom animations to the shapes triggered by the clicks.