Poster, you're question isn't quite as clear as it could be. If the CP receives a large inheritance doesn't necessarily mean the NCP would responsible for paying more. Either way, whether or not it affects the amount depends on how much is a "large inheritance."
Vermont Modification of Orders Published: October 18, 2005
"...For modification of a Child Support Order, a change is considered real and substantial if it would make the child support amount payable under the child support guidelines at least 10% higher or lower than the amount currently paid as per the current Child Support Order. This may occur when one of the following occurs: one parent's income changes substantially; involuntary loss of employment, where wages are replaced by unemployment compensation, worker's compensation or disability benefits; substantial inheritance; promotion, and; changes in the parenting plans. Voluntarily quitting one's job cannot be used to justify a reduction in child support, unless such termination of employment was done for good reasons." [emphasis added]