PA-ETEP allows you to create multiple Walkthroughs. Below is list of your options...

1)  Running Record Walkthrough - You can create a Walkthrough and keep coming back to it, either adding more comments or editing previously created comments. (See screen grab)

2)  New Walkthrough - You can create as many brand new and separate Walkthroughs by clicking the Create New button. (See screen grab)

3)  Follow-Up Wallkthrough - You can create a new/separate Walkthrough that retains the comments of a previous Walkthrough by clicking on the Follow-Up button. (See screen grab)

FYI - These options also apply to Anecdotal Notes.