I shared two different methods to execute(run) only one step in a Job. For example, you have a JCL with 10 steps and you want to execute only one step. Then, to do this just follow the below two ideas.

Sample JCL you need to execute SPUFI from batch JCL (job).

Do you want to know Batch SPUFI?

How to Execute SPUFI from JCL

Sample JCL you need to execute SPUFI from batch JCL (job).

Here, I want to execute only step 5. How can I do it?

One way is to use RESTART from STEP05. But the problem is it tries to execute subsequent steps. Insert the null statement after STEP05 to prevent the execution of subsequent steps.
But one decent way is you don’t need to touch the code in job steps, just alter only Job card. In the JOB CARD use the COND parameter. When the Job is executed, only the Step mentioned in the RESTART parameter will get executed. e.g., RESTART=STEP05, COND= (0, LE)