Final answer:
To maintain new growth in locks, one should use the palm rolling or twist and rip methods, integrating the new hair into existing locks gently, possibly with the aid of locking gels or creams.
Step-by-step explanation:
To cultivate new growth and form a lock after several weeks of using extensions, the palm rolling or twist and rip methods are typically used. During the maintenance process, new growth is carefully twisted and intertwined with the existing lock to encourage the hair to continue locking in the new pattern. It's important to approach this gently to avoid breakage and unnecessary tension at the roots. It may also be helpful to use locking gels or creams to provide additional hold during the process.