diff --git a/bazel/properties.go b/bazel/properties.go
index 15af09b..702c31c 100644
--- a/bazel/properties.go
+++ b/bazel/properties.go
@@ -288,6 +288,41 @@
 	return result
 }
 
+// FirstUniqueBazelLabelListAttribute takes a LabelListAttribute and makes the LabelList for
+// each axis/configuration by keeping the first instance of a Label and omitting all subsequent
+// repetitions.
+func FirstUniqueBazelLabelListAttribute(attr LabelListAttribute) LabelListAttribute {
+	var result LabelListAttribute
+	result.Value = FirstUniqueBazelLabelList(attr.Value)
+	if attr.HasConfigurableValues() {
+		result.ConfigurableValues = make(configurableLabelLists)
+	}
+	for axis, configToLabels := range attr.ConfigurableValues {
+		for c, l := range configToLabels {
+			result.SetSelectValue(axis, c, FirstUniqueBazelLabelList(l))
+		}
+	}
+
+	return result
+}
+
+// SubtractBazelLabelListAttribute subtract needle from haystack for LabelList in each
+// axis/configuration.
+func SubtractBazelLabelListAttribute(haystack LabelListAttribute, needle LabelListAttribute) LabelListAttribute {
+	var result LabelListAttribute
+	result.Value = SubtractBazelLabelList(haystack.Value, needle.Value)
+	if haystack.HasConfigurableValues() {
+		result.ConfigurableValues = make(configurableLabelLists)
+	}
+	for axis, configToLabels := range haystack.ConfigurableValues {
+		for haystackConfig, haystackLabels := range configToLabels {
+			result.SetSelectValue(axis, haystackConfig, SubtractBazelLabelList(haystackLabels, needle.SelectValue(axis, haystackConfig)))
+		}
+	}
+
+	return result
+}
+
 type Attribute interface {
 	HasConfigurableValues() bool
 }