Colorado Worksheet A — Child SupporObligationio— - Sole Physical Care is a form used to calculate the amount of child support that a parent in Colorado must pay when they are the only parent with physical custody of the child. This form is used in cases where the parents are not living together and the non-custodial parent does not have any visitation rights. The worksheet calculates the amount of support based on the parent's income, number of children, and other factors such as health insurance premiums and daycare costs. There are three types of Colorado Worksheet A — Child SupporObligationio— - Sole Physical Care: Basic Support, Standard Support, and Extraordinary Support.