If you want to insert some slides from other presentation into current one, what do you choose?

Assuming you are using Microsoft PowerPoint, then below is the procedure:

1. On the Home tab, click the arrow next to New Slide, as if you were going to insert a new slide and choose a layout for it first.
2. Below the layout gallery, click Reuse Slides.
3. In the Reuse Slides task pane, under Insert slide from, click Browse to find the presentation or slide library that has the slides you want. Then click the arrow to open those slides in the task pane.
4. When you find the slide you want, take notice of the Keep source formatting check box, at the very bottom of the pane. If you want to retain the exact look of the slides you're inserting, be sure this check box is selected before you insert the slide.
5. Click each slide you want to insert. Each one is copied into the open presentation, below the currently selected slide or below your cursor, if you've positioned it beneath a slide thumbnail.NOTE: If you don't select Keep source formatting, the inserted slides inherit the look, or theme, that your current slides use. (The theme is what dictates the overall design and colors for the presentation; more about that in the next lesson.)

i agree with MR Qaisar Afzal