ABGroupMBS.addProperty(propertyName as string, type as Integer) as Integer

call ABGroupMBS.addProperty "GroupWeight",1

Property name must be unique.
For types see typeOfProperty.
Returns the number of properties successfully added.

ABGroupMBS.properties as string()

Returns nil on any error.

ABGroupMBS.removeProperties(properties() as string) as Integer

Returns the number of properties successfully removed.

ABGroupMBS.removeProperty(propertyName as string) as Integer

Returns the number of properties successfully removed.

ABGroupMBS.searchElementForProperty(PropertyName as string, Label as string, Key as string, value as Variant, comparison as Integer) as ABSearchElementMBS

property: The name of the property to search on. It cannot be "".
label: The label name for a multivalue list. If property does not have multiple values, pass "". If property does have multiple values, pass "" to search all the values. By default, ABGroup records don't contain any multivalue list properties.
key: The key name for a dictionary. Pass "" if property is not a dictionary. If property is a dictionary, pass "" to search all keys. By default, ABGroup records don't contain any properties that are dictionaries.
value: What you're searching for. If "", the only supported value for comparison is kABEqual or kABNotEqual.
comparison: The type of comparison to perform and is an ABSearchComparison, such as kABEqual or kABPrefixMatchCaseInsensitive.

ABGroupMBS.typeOfProperty(propertyName as string) as Integer

Possible values:

const kABMultiValueMask = &h100
const kABErrorInProperty = &h0
const kABStringProperty = &h1
const kABIntegerProperty = &h2
const kABRealProperty = &h3
const kABDateProperty = &h4
const kABArrayProperty = &h5
const kABDictionaryProperty = &h6
const kABDataProperty = &h7
const kABMultiStringProperty = kABMultiValueMask + kABStringProperty
const kABMultiIntegerProperty = kABMultiValueMask + kABIntegerProperty
const kABMultiRealProperty = kABMultiValueMask + kABRealProperty
const kABMultiDateProperty = kABMultiValueMask + kABDateProperty
const kABMultiArrayProperty = kABMultiValueMask + kABArrayProperty
const kABMultiDictionaryProperty = kABMultiValueMask + kABDictionaryProperty
const kABMultiDataProperty = kABMultiValueMask + kABDataProperty