Update documentation

docs/help/export_menu.md

@@ -227,4 +227,4 @@ This will generate a list-formatted HTML file, and launch your system's web brow
 
 ---
 
-[<< Previous](project_notes_menu) -- [Next >>](tools_menu)
+[<< Previous](project_notes_menu) -- [Next >>](import_menu)

docs/help/help.md

@@ -46,8 +46,10 @@ With [arcs](arcs), you can link your plot to the narrative.
 - **[Characters menu](characters_menu)**
 - **[Locations menu](locations_menu)**
 - **[Items menu](items_menu)**
+- **[Plot menu](plot_menu)**
 - **[Project notes menu](project_notes_menu)**
 - **[Export menu](export_menu)**
+- **[Import menu](import_menu)**
 - **[Tools menu](tools_menu)**
 - **[Tree view context menu](tree_context_menu)**
 

docs/help/import_menu.md

@@ -0,0 +1,14 @@
+[Project homepage](../index) > [Instructions for use](../usage) > [Online help](help) > Command reference: Import menu
+
+--- 
+
+# Import menu 
+
+**File Import**
+
+---
+
+
+---
+
+[<< Previous](export_menu) -- [Next >>](tools_menu)

docs/help/plot_menu.md

@@ -0,0 +1,34 @@
+[Project homepage](../index) > [Instructions for use](../usage) > [Online help](help) > Command reference: Plot menu
+
+--- 
+
+# Plot menu 
+
+**Plot elements operation**
+
+--- 
+
+## Add Arc
+
+**Add a new story arc**
+
+You can add a project note to the tree with **Plot > Add arc**.
+
+- If a item is selected, the new item is placed after the selected one.
+- Otherwise, the new item is placed at the first position.   
+- The new item has an auto-generated title. You can change it in the right pane.
+
+--- 
+
+## Show plot list
+
+**Show an HTML report with plot elements**
+
+This will generate a list-formatted HTML file, and launch your system's web browser for displaying it. 
+
+- The Report is a temporary file, auto-deleted on program exit.
+- If needed, you can have your web browser save or print it.
+
+---
+
+[<< Previous](items_menu) -- [Next >>](project_notes_menu)

docs/help/project_notes_menu.md

@@ -2,8 +2,6 @@
 
 --- 
 
-**NOTE:** This help page applies to *novelyst* and is not yet updated for *noveltree*.
-
 # Project notes menu 
 
 **Project notes operation**
@@ -16,9 +14,9 @@
 
 You can add a project note to the tree with **Project notes > Add**.
 
-- If a item is selected, the new item is placed after the selected one.
-- Otherwise, the new item is placed at the first position.   
-- The new item has an auto-generated title. You can change it in the right pane.
+- If a project note is selected, the new item is placed after the selected one.
+- Otherwise, the new project note is placed at the first position.   
+- The new project note has an auto-generated title. You can change it in the right pane.
 
 --- 
 
@@ -33,4 +31,4 @@ This will generate a list-formatted HTML file, and launch your system's web brow
 
 ---
 
-[<< Previous](items_menu) -- [Next >>](export_menu)
+[<< Previous](plot_menu) -- [Next >>](export_menu)