Which of the following is one of the steps in a walkthrough?

Creating documentation is indeed a step in a walkthrough. A walkthrough is a methodical review process, often used during the testing phase of a system to ensure that processes are understood and thoroughly documented. This often involves outlining each step of a workflow, identifying key controls, and recording any issues or deviations from the expected process. By creating documentation, stakeholders can ensure that there is a clear record of the processes, responsibilities, and controls, which can be referenced in future audits or system improvements.

The other options are less relevant in the context of a walkthrough. Documenting financial transactions relates more to recording financial activities rather than reviewing processes. Establishing new data policies focuses on the creation of guidelines and rules around data management and usage, which is broader and not specifically tied to the walkthrough process. Analyzing customer feedback involves gathering and assessing information from customers, which is distinct from the systematic review of processes and control steps that characterize a walkthrough.