I am translating a PowerPoint file in SDL Studio 2017. Somebody or something has inserted a large number of what look like tags in the text consisting of numbers enclosed in parentheses like this: {20}. These are not heading anyway; they are simply in the heading and body text of the PowerPoint itself.

When Studio reads in the PowerPoint file, which apparently does without problems, it brings in these "tags" as well. I would like to exclude all these tags as they will mess up the translation memory with invalid translation units. What is the best way to go about this?

Thanks
Dan