Dear Saber, thank you!
But this tools allows me to complete a polygon "inside" another.
I'm searching for a tool that alow me to complete a polygon outside another, that has common sides
If I have polygon 1 and 2, andI wan to to digitize polygon 3, I'm searching a tool that allow me to digitize pol 3 without redraw the common sides with 1 and 2 (in thi case ise very simple redraw,, but with complex and natural polygons it is an heavy WORK!!)
Thank you.

Tata
Il 06/03/2014 11:14, Saber Razmjooei ha scritto:
If I have understood your question correctly, you can use AutoTrace plugin.

See more details here:
http://www.lutraconsulting.co.uk/resources/autotrace

Cheers
Saber

On 6 Mar 2014 10:05, SIT delle Riserve Naturali di Legambiente Sicilia <[email protected]> wrote:
Hi, 
I have to add a new polygon to other existing; they have obviously 
common sides; how can I draw only sides not common? 
Thank you 

Tata Livreri 

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**************************************** 
Legambiente Comitato Regionale Siciliano 
Ufficio Gestione Riserve 
Sistema Informativo Territoriale 
tel 0916262697 - 0906264139 
www.legambienteriserve.it 
via Tripoli 3 - Palermo 90138 
****************************************** 

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-- 
****************************************
Legambiente Comitato Regionale Siciliano
Ufficio Gestione Riserve
Sistema Informativo Territoriale
tel 0916262697 - 0906264139
www.legambienteriserve.it
via Tripoli 3 - Palermo 90138
******************************************
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