You can take cuttings of now. You can use a powder or liquid rooting hormone. Just remember to not overdo the hormone as a little goes a long way and too much will actually cause the darn things to not root at all or very little.

Use a fast draining media such as 1/2 perlite and 1/2 pumice for the cuttings...I have used sand in the past with some success but like the 1:1 mix best. Keep in a bright but shaded location. Too much misting and humidity can cause fungus growth on the fuzzy grey foliage. Keep the rooting media moist (not wet) to ensure root production.

Root zone heating is recommended for faster rooting especially if you are doing this indoors.

It will take at least a month for good roots to appear and in optimum conditions you should be able to transplant at 40 days.

yeah, but as I indicated, I can not bring a cutting back with me.

Does Helichrysum italicum produce viable seeds?

Yes, it does.
"Seed - sow February/March in a greenhouse. The seed usually germinates in 2 - 3 weeks at 20°c. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for at least their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts."

Here is a link that might be useful: Plants for a Future

In general rooting hormones should NOT be used on edible plants.

Just to follow up on ramon5000, Helichrysum italicum is not edible, though it has useful medicinal topical applications (bruises, varicose veins, etc).

It is often confused with another plant known as a "curry plant," which is Murraya koenigii and is used in cooking. They look entirely different, but are unfortunately often sold as the same thing. Even their other names are confused and used interchangeably (immortelle, everlasting).