diff --git a/src/branch_tier.cpp b/src/branch_tier.cpp
index e01ddefa..4883fc42 100644
--- a/src/branch_tier.cpp
+++ b/src/branch_tier.cpp
@@ -70,3 +70,16 @@ BranchTier::BranchTier(toml::value const &v_)
         l::load_branch_scan(table,_branches);
     }
 }
+
+void
+BranchTier::copy_enabled_rw(BranchTier &bt_)
+{
+  for(auto const &b : _branches)
+    {
+      if(b.enabled == false)
+        continue;
+      if(b.mode != Branch2::Mode::RW)
+        continue;
+      bt_.emplace_back(b);
+    }
+}