Summarize this article:

Both the main perfume and your travel bottle include a covering cap. Gently lift off the cap from both. Then, twist off the sprayer from the glass or plastic travel bottle. This way, you can easily refill from a splash bottle of perfume.  Splash perfume is applied by pouring a small dab of perfume or cologne onto your neck or wrist, rather than spraying it into the air. If your travel bottle comes with a decorative, metal casing, simply slip it off so you can see how much perfume is in the travel bottle. This method does not work for metal perfume atomizers. Use a tiny craft funnel to easily pour in your perfume. The funnel easily fits into the top of your glass or plastic travel perfume bottle. The funnel catches every drop of your perfume so none of it is wasted upon transfer. Once the travel bottle is full, twist the sprayer back into place, and put the cap on top. Then, slide the travel bottle into the casing if it came with 1. In addition, replace the cap on your splash perfume bottle.

Summary:
Remove the cap from the main bottle and the sprayer of the travel bottle. Place a small funnel at the top of the travel bottle. Replace the sprayer, casing, and cap on your travel bottle.