How to update unit reference in testcomplete

HI Team,

              I have 20 application is same project and 150 unit files are there but i want to individual project and difference units while i am doing manually 

---------------------------
TestComplete
---------------------------
Syntax error(s).

The USEUNIT section contains a reference to the 'XXX' unit that was not found in the project.

Error location:
Unit: "X\XX\Script\XXX"
Line: 1 Column: 1.
---------------------------
OK Help
---------------------------