Hi Jothi,
I hope you are keeping well.
TestComplete allows you to call tests from another project using the Importing Tests option;
https://support.smartbear.com/testcomplete/docs/testing-with/creating/importing.html
You also could add a project item from another project or from an external file using the steps outlined in the following guide https://support.smartbear.com/testcomplete/docs/working-with/managing-projects/project-items/adding-and-removing.html
Please let me know if this resolves your query or if you have any additional questions.
Thanks,
Shane