how do I take geranium cuttings please?

Try to take some cuttings now, then if possible save the plant ready for next year.

Olywn you can hang geraniums plants or leave them in pots in a darkish cold place such as a garage but if you want more plants then its cuttings.
Remove a cutting with about 2 or 3 leaf joints from the top. Cut the stem just below a leaf joint and remove the lowest leaves insert bare stem into the cutting compost. If the cutting has any flower heads on it they should be removed. place on window sill or in green house. (I dip mine in hormone rooting powder befor putting in th compost)
When your chrysanthemums have finished flowering dig up the plants and cut back all the stems to about 6in Put the chrysanthemums in a box and cover with soil or compost and store them in a cool, frost-free place for the winter. A garage or garden shed is ok for this as long as it is frost-free keep the soil slightly moist throughout the winter. take cuttings in the spring

go on google and ask for grernium cutings you will get everything fully explaned step by step,better that I can explain it.

Do you have to take cuttings from chrysanthemums stored like this or can you replant the original plant?

Cestina' you take cuting's from chrysanthemums from new groth in January over winter make shore they don't dry out and feed for a couple of week's befor you take the cutings, this way you will have fine plants.

thanks to you all,I will act on all the advice given Olwyn