While changing the data type to numeric column data changed from 00000 to 0,

[#1]

Hi Team,

Need help to avoid the round off, 
like when changed from character to numeric column value changed from 0000 to 0 
please suggest some solution ,

i need the same entire string for analysis

[#2]

Zero is represented numerically as 0, so JMP is correct. If you want to format (display) zero differently, then change the Format attribute of the data column.

I do not find such a format, so you will have to make one. See the JMP Help section about custom formats.

[#3]

I don't really understand why you would want to change the column to numeric but retain a code of 0000 rather than 0.  Presumably, 0000 means something other than 0, such as missing data, not applicable, etc.  I would think that it would be better to create a new nominal variable indicating whether or not that code (and what it represents) is present, and then recode the original column so that 0000 becomes missing rather than 0.  If I am not understanding what the data represents, then perhaps you don't really want it to be continuous data at all.