diff --git a/src/associations.hpp b/src/associations.hpp
new file mode 100644
index 0000000..41df157
--- /dev/null
+++ b/src/associations.hpp
@@ -0,0 +1,58 @@
+#pragma once
+
+#include <boost/container/flat_map.hpp>
+#include <boost/container/flat_set.hpp>
+#include <memory>
+#include <sdbusplus/asio/object_server.hpp>
+#include <string>
+#include <vector>
+
+//  Associations and some metadata are stored in associationInterfaces.
+//  The fields are:
+//   * ifacePos - holds the D-Bus interface object
+//   * endpointsPos - holds the endpoints array that shadows the property
+static constexpr auto ifacePos = 0;
+static constexpr auto endpointsPos = 1;
+using Endpoints = std::vector<std::string>;
+
+using AssociationInterfaces = boost::container::flat_map<
+    std::string,
+    std::tuple<std::shared_ptr<sdbusplus::asio::dbus_interface>, Endpoints>>;
+
+// The associationOwners map contains information about creators of
+// associations, so that when a org.openbmc.Association interface is
+// removed or its 'associations' property is changed, the mapper owned
+// association objects can be correctly handled.  It is a map of the
+// object path of the org.openbmc.Association owner to a map of the
+// service the path is owned by, to a map of the association objects to
+// their endpoint paths:
+// map[ownerPath : map[service : map[assocPath : [endpoint paths]]]
+// For example:
+// [/logging/entry/1 :
+//   [xyz.openbmc_project.Logging :
+//     [/logging/entry/1/callout : [/system/cpu0],
+//      /system/cpu0/fault : [/logging/entry/1]]]]
+
+using AssociationPaths =
+    boost::container::flat_map<std::string,
+                               boost::container::flat_set<std::string>>;
+
+using AssociationOwnersType = boost::container::flat_map<
+    std::string, boost::container::flat_map<std::string, AssociationPaths>>;
+
+/** @brief Remove input association
+ *
+ * @param[in] sourcePath          - Path of the object that contains the
+ *                                  org.openbmc.Associations
+ * @param[in] owner               - The Dbus service having its associations
+ *                                  removed
+ * @param[in,out] server          - sdbus system object
+ * @param[in,out] assocOwners     - Owners of associations
+ * @param[in,out] assocInterfaces - Associations endpoints
+ *
+ * @return Void, server, assocOwners, and assocInterfaces updated if needed
+ */
+void removeAssociation(const std::string& sourcePath, const std::string& owner,
+                       sdbusplus::asio::object_server& server,
+                       AssociationOwnersType& assocOwners,
+                       AssociationInterfaces& assocInterfaces);