Hello Jim,

The described scenario seems to be based on custom needs which can be covered with Test Studio current capabilities. The random generator step assigns the value to a variable. This variable can be used in a coded step and modified as per the specific requirements of the automation scenario - in this example by using string concatenation functions. Once the new value is present it can be assigned to another variable and then passed to the next steps where necessary through the variable's name. 

Here is the help article on using variable in coded step. The last section of the article describes a complete scenario and a sample test project to demonstrate it. 

Feel free to submit a private support thread if you need additional assistance on adjusting the coded step. 

Regards,
Elena
Progress Telerik