If a scientist wanted to manipulate DNA like create their very own from another cell

Question

how would they do this

Answer 1

there many approaches:

Genetic engineering, recombinant DNA approach, transfection, protonomics, mutation, cloning,  combination all of mentioned and more

Answer 2

hmm,it would be genetic modification,but it isn't as easy as it seems,cause the DNA is more complicated then u can tink of,a little change in DNA and it could mean a huge change