Windows – How to launch a Power Point slide show on startup

Try this:

Open the presentation containing your contact details slide and put PPT in slide sorter view. Select the contact details slide.

Switch to another presentation that needs this slide, insert a new slide (preferably blank) then use the Paste Special command and choose to Link.

If necessary, enlarge the linked slide image to fill your new slide.

Headers/Footers are fairly badly broken in PPT 2007 and beyond. There are ways of getting them to work but honestly, it's far simpler to do what you want this way:

Go to Slide Master view.

To the topmost master, add the header text you want to use. Normally it'll appear on each of the layouts indented below the master, but in some cases, might not. In that case, copy/paste it to each of the layouts where it's missing, but desired.

If there are multiple masters in your presentation, you might need to copy/paste the text there too.

The only hitch here is that content on individual slides can cover the text from the master. In that case you'd need to decide. If it's ok, then no worries. If not, either adjust the position/size of the content on the slide or copy/paste the text on top of the slide from the master.