Here is a tutorial on how to change languages in a Google Slide presentation.
Perhaps consider using a Google slide presentation instead of PPT?
It looks like Sindhi is one of the languages available.
I have seen PowerPoint creation ideas in Google searches that explain how to create PowerPoint presentations. Because I do not read Sindhi, I do not know which of these search results would best help you. Perhaps email@example.com can provide more specific information about how to develop the presentation in Sindhi.