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I have a polygon but would like it to be in broken up to put into different layers. I can't work out how to do this.

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do you have one polygon or one layer with multiple polygons? which rules do you want to apply? we need more info –  underdark Nov 22 '12 at 19:45
    
1 layer with multiple polygons. I want to split one of them up into smaller multiple polygons. –  Liz Nov 22 '12 at 22:16
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Do you want to split up them based on an attribute? Do you wish to cut them against another polygon or polyline layer? What do the polygons represent? More information please. –  Fezter Nov 22 '12 at 23:41
    
They have the same attribute and that is fine. I wish to keep them in the same layer. There are two polygons that are snapped to the same line and therefore share many nodes. I want to be able to move or delete the nodes of one polygon without interfering with the other one. At the moment I can move/delete a node which then affects both polygons. –  Liz Nov 23 '12 at 8:37
    
@Liz: to be able to move or delete the nodes of one polygon without interfering with the other one, you can go to Settings -> Snapping options -> uncheck the box with label "Enable topological editting". Then you can edit vertices of each polygon separately. –  Cao Minh Tu Nov 27 '12 at 1:05
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1 Answer 1

Depending on what you want to do, you could either use the 'split features' tool (line with black scissors) to cut a single polygon into several pieces or, if you want to create several layers/shapes from one shape, select the features you want to separate and save the selection as new shapfile. (right click on the layer -> save selevtion as)

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I want to cut a single polygon into pieces and tried the the s'split features' tool. It came up with an error –  Liz Nov 22 '12 at 22:14
    
"The geometry is invalid. Please repair before trying to split it." and it has created more nodes! I think I am using it wrong. –  Liz Nov 22 '12 at 22:16
    
I want the polygons to be unconnected and completely separate. –  Liz Nov 22 '12 at 22:17
    
Try 'Vector -> Geometry tool -> Check geometry validity' to fix the polygon. –  GR_ Nov 22 '12 at 22:37
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