I created one large bitmap and divided it into equal portions. Each portion serves as a single animation frame. I'm able to cycle through the frames, however my code to do so is redundant. Here is a sample:
while (1)
{if (key_cud == 1)
{animate_x = 0;
animate_y = 60;
wait(wait_time);
animate_y = 120;
wait(wait_time);
}
else animate_y = 0;
I tried "animate_y += 60;", but this only skips to 120, completely by passing frame 60. Please offer suggestions.

im not sure what you re doing with your code there but animated sprites can be animated with frame , like my.frame+=10*time;

have you looked in the manual?

while (1) {
my.frame += time_step; // 16 frames per second
if (my.frame > 30) { my.next_frame = 20; } // interpolate to start frame
else { my.next_frame = 0; } // interpolate to FRAME+1
if (my.frame >= 31) { my.frame -= 10; } // if end frame reached, skip back
wait(1);
}

use somewhere in the code
while(!key_cud){wait(1);}
to make it pause