Put all your objects on the slide, and then from custom animations, have them appear after previous with the amount of delay that you need.

I need to create a slide where I stack objects and have them appear one at a
time. Could someone tell me how to do this. I haven't used Powerpoint in a
long time can't seem to remember. I guess you would apply animation to the
objects but I am not sure how to do it.

Thanks in advance for any help.

Regards,

Dee

Start by clicking on an object and choosing Custom Animation from the
Slide Show Window. Depending on the version you use, what you see might
be different. In 2002 and 2003, you will see a task pane on the right of
your screen, with a button to add an entrance effect. If the objects are
stacked on top of each other, you might need to use the TAB and shift-TAB
keys to select different objects, or you might put them next to each
other until you get the animations set and then move them back on top of
each other.
--David

What PowerPoint version are you using?
An easier way is to put one object on each slide. Then, click Slide Show >
Slide Transition.
Hold down Ctrl or Shift, then select the slides that you want to add
transition to.
Now, apply a transition. Do NOT click apply to all slides unless that's what
you intend to do.

Alternately for PowerPoint 2002/XP and above,
Stack up all the objects on a slide, then select them all.
Click Slide Show > Custom Animation.
Click Add Effect > Entrance > Any effects of your preference.
Again, Click Add Effect > Exit > Any effects of your preference.
Re-order the animations in such a way:
Entrance 1, Exit 1, Entrance 2, Exit 2, Entrance 3, Exit 3... etc
Finally, set all the Entrance effects to "With Previous".