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I have 300 polygons in a single shapefile, I want merge some polygons together, when I merge two polygons the attribute does not come total count of two polygons,

What I need is, when I merge two polygon the attribute value has to add together and the total value has to come in merged polygon attribute.

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Could you please reword this question. Are you talking about creating single part features or dissolving boundaries? – Aaron Nov 18 '12 at 16:36
What do you mean by "total value"? – Cindy Williams-Jayakumar Nov 18 '12 at 20:00
If I understood you well,you wish to merge the polygons by selecting them in Edit mode and then merge them. Am I correct? – Alexandre Neto Nov 18 '12 at 22:20
Alexandre Neto is right, when i Merge two polygon in Edit mode, the polygons are merging but the attribute does not calculate. – Mahesh Nov 19 '12 at 14:36

Use the dissolve tool in the toolbox: Datamanagement > Generalisation .

You can dissolve 2 fields with a common value with variable: dissolve_field

You can set the field you want to summerize in the variable: statistics_fields

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Thanks a lot... – Mahesh Dec 19 '12 at 9:23

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