i have a photoshop question?

[guitarist2309]

so i am drawing a map in photoshop that is 500pixels by 400 pixels. i want to continue drawing the map so that i can add on more to it, maybe make it 1000 pixels by 1000pixles, so i can add in other cities. hw would i do this on photoshop cs on my mac computer?

[Birdie]

um..

File>new>1000by1000pixels

edit>copy>paste.

[prismpalace]

In your existing document...
Select--->All
Edit--->Copy
File--->New
1000x1000pixels
Edit--->Paste