If you've purchased a Lancome refillable perfume, you don't need to transfer to a refillable bottle. The perfume refill easily attaches to your current bottle, making refilling easy.
If your currrent bottle is not refillable and you want to transfer to another bottle, be very careful doing so, as perfume can easily evaporate, meaning you can lose some of your fragrance in the process. The less air exposure the better, so tools like pipettes are useful.