Hi,

Yeah, you can do that by Filter the Slider by a special category or tags.

Example for filter the slider by use tags. Let's do following steps:

1/ Go to Posts > Tags > create a new tag - example:  "featured"

2/ Add this tag for all posts you want to display on the slider.

3/ Go to Customize > Featured Slider Options > on "Filter Slider By" > select "Featured Tags"

4/ Fill tag slug of tag "featured" to option below it "Fill List Featured Tags for Featured Slider"

Best Regards,

PenciDesign