HWPS-Actions.md

@@ -697,9 +697,20 @@ By default, the chosen point is the MRS point "Position point".
 ![#c5f015](https://placehold.it/15/c5f015/000000?text=+)
 **Sash position action** <a name="Sashpositionaction"></a>
 - [return to action list](#TopList)
-- Definition
-- Use case
-- Parameters
+- Definition: this action defines the position of the leaf in the parent structure - dynamic opening process
+
+![image](uploads/b166e268d42a3318599eff0834aea460/image.png)
+
+- Use case: dynamic opening process
+- Parameters:
+  - **Sash ID**: Reference leaf index for defining the position
+  - **Left point**: Reference point, on the parent bar, for positioning the leaf to the left of this bar
+  - **Right point**: Reference point, on the parent bar, for positioning the leaf to the right of this bar
+  - **Index Element**: Parameterisation value - defined by the parameteriser 
+  - **D1**: Offset value of the opening bar in relation to the uniform division of the parent mesh into N leaves - dimension 1 - see definition of A1 for "standard" opening processes
+  - **D2**: offset value of the opening bar with respect to the uniform division of the parent mesh into N leaves - side 2 - see definition of A2 for "standard" opening procedures 
+
+since 2.1
     
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 ![#c5f015](https://placehold.it/15/c5f015/000000?text=+)