One way to achieve this would be create an excel sheet with the list of all the test cases that you want to execute.
Then in your code, load the excel sheet & use a for loop toecute all the test cases that are listed in the excel sheet.
P.S.: To have more control over your excel sheet, you can include an 'Execute' column in your excel sheet with values - Yes & No. Then write the code in such a way that QTP executes only those test cases where the value of the execute column is 'Yes'.