diff --git a/src/blackmisc/propertyindex.cpp b/src/blackmisc/propertyindex.cpp
index ceac5e172..ab98a962a 100644
--- a/src/blackmisc/propertyindex.cpp
+++ b/src/blackmisc/propertyindex.cpp
@@ -114,4 +114,11 @@ namespace BlackMisc
         return list;
     }
 
+    void CPropertyIndex::prepend(int newLeftIndex)
+    {
+        QList<int> newList = indexList();
+        newList.prepend(newLeftIndex);
+        this->setIndexStringByList(newList);
+    }
+
 } // namespace
diff --git a/src/blackmisc/propertyindex.h b/src/blackmisc/propertyindex.h
index 8a5840054..8ccc07db9 100644
--- a/src/blackmisc/propertyindex.h
+++ b/src/blackmisc/propertyindex.h
@@ -90,6 +90,9 @@ namespace BlackMisc
         //! Index list
         QList<int> indexList() const;
 
+        //! Shif existing indexes to right and insert given index at front
+        void prepend(int newLeftIndex);
+
         //! First element casted to given type, usually then PropertIndex enum
         template<class CastType> CastType frontCasted() const
         {
diff --git a/src/blackmisc/propertyindexvariantmap.cpp b/src/blackmisc/propertyindexvariantmap.cpp
index 4239be2d6..1b169e4a1 100644
--- a/src/blackmisc/propertyindexvariantmap.cpp
+++ b/src/blackmisc/propertyindexvariantmap.cpp
@@ -138,6 +138,18 @@ namespace BlackMisc
         this->addValue(index, QString(str));
     }
 
+    void CPropertyIndexVariantMap::prependIndex(int index)
+    {
+        QMap<CPropertyIndex, CVariant> newMap;
+        for (const CPropertyIndex &pi : this->indexes())
+        {
+            CPropertyIndex newPi(pi);
+            newPi.prepend(index);
+            newMap.insert(newPi, this->m_values[pi]);
+        }
+        this->m_values = newMap;
+    }
+
     /*
      * Indexes
      */
diff --git a/src/blackmisc/propertyindexvariantmap.h b/src/blackmisc/propertyindexvariantmap.h
index 8ee1846a7..c08cf862d 100644
--- a/src/blackmisc/propertyindexvariantmap.h
+++ b/src/blackmisc/propertyindexvariantmap.h
@@ -61,6 +61,9 @@ namespace BlackMisc
         //! Add a value as non CVariant
         template<class T> void addValue(const CPropertyIndex &index, const T &value) { this->m_values.insert(index, CVariant::fromValue(value)); }
 
+        //! Prepend index to all property indexes
+        void prependIndex(int index);
+
         //! Is empty?
         bool isEmpty() const { return this->m_values.isEmpty(); }