diff --git a/cmd/edit.go b/cmd/edit.go
index ed9f502..2fc3c4f 100644
--- a/cmd/edit.go
+++ b/cmd/edit.go
@@ -110,13 +110,38 @@ func inEditableDir(filepaths []string) (string, error) {
 }
 
 func copyTodoToDir(d string, filepaths []string) error {
+	inboxes := []string{}
 	for _, target := range filepaths {
 		p := path.Join(d, path.Base(target))
+		if strings.Contains(path.Base(target), ".todo.") {
+			inboxes = append(inboxes, target)
+			continue
+		}
 		if root, err := pttodo.NewRootFromFile(target); err != nil {
 			return err
 		} else if b, err := yaml.Marshal(root.Todo); err != nil {
 			return err
-		} else if err := ioutil.WriteFile(p, b, os.ModePerm); err != nil {
+		} else if err := os.WriteFile(p, b, os.ModePerm); err != nil {
+			return err
+		}
+	}
+	for _, inbox := range inboxes {
+		target := path.Join(path.Dir(inbox), strings.Split(path.Base(inbox), ".todo.")[0])
+		p := path.Join(d, path.Base(target))
+
+		root, err := pttodo.NewRootFromFile(p)
+		if err != nil {
+			return err
+		}
+		subroot, err := pttodo.NewRootFromFile(inbox)
+		if err != nil {
+			return err
+		}
+		root.MergeIn(subroot)
+
+		if b, err := yaml.Marshal(root.Todo); err != nil {
+			return err
+		} else if err := os.WriteFile(p, b, os.ModePerm); err != nil {
 			return err
 		}
 	}