SQL select statement using same column twice

I have a simple select statement from one table that lists the same numeric column (TRANAMT) twice. If the number is positive ('>'0) I want it to show in the first reference of TRANAMT. If the number is negative ('<'0) I want it to should in the next reference of TRANAMT. Ideally if the number is positive it will show on the first reference and the second will display 0 or null. If negative the first reference shows 0 or null and the second reference shows the negative number.

select FNAME, LNAME, TRANAMT, TRANAMT from CMLEDG

Please let me know if this is possible. Thanks Ken