
If you are relocating them, you can go ahead and replant in their new location.
You can also pot them up in pots.
Drying and storing the bulbs is also an option.
Here are links that will help you.
https://www.gardeningknowhow.com/ornamental/bulbs/daffodil/daffodil-planting-care-tips-how-to-plant-daffodils-in-your-garden.htm
https://www.gardeningknowhow.com/ornamental/bulbs/daffodil/daffodil-bulbs-after-blooming.htm
https://www.gardeningknowhow.com/ornamental/bulbs/daffodil/dividing-daffodil-bulbs.htm
https://www.gardeningknowhow.com/ornamental/bulbs/daffodil/curing-daffodil-bulbs.htm
https://www.gardeningknowhow.com/ornamental/bulbs/daffodil/pruning-daffodils.htm