hi debbie,
linking is a method, best well know by jan williamson and prue miskin.
http://www.positivehealth.com/permit/Articles/Reflexology/willi29.htm
this site gives a brief description but basically you are working much more with the subtle energies and linking 2 or 3 points to balance them or have a beneficial effect.
susanne enzer, in her maternity reflexology techniques, uses balancing links on the endocrine system.
once you complete your basic training there are many CPD (continuing professional development) courses that you can either go on, or do lots more research and reading to enhance your practise.
we never have to stop learning and evolving what we do ).