Added documentation for bulk update

foundation/www/docs/user/manual/en/using-erpnext/articles/bulk-update.md

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+#Update existing records in bulk
+
+Bulk Update tool helps you in over-writing value of a specific field in existing records.
+
+<img alt="Emailing Attachments" class="screenshot" src="{{docs_base_url}}/assets/img/articles/bulk-update-tool.png">
+
+If you would like to overwrite value of a field based on certain condition you can use bulk update with conditions.
+
+Lets say you have a customer group named 'Commercial' and you would like to change that to 'Retail' for all customer records.
+
+Below are the steps to do so...
+
+#### Step 1: Open Bulk Update
+
+You can open bulk update tool by typing and selecting Bulk Update in Awesome Bar or Search Bar at the top.
+
+#### Step 2: Select the DocType
+
+All the Document Types are listed in 'Document Type' field.
+
+Select Customer in 'Document Type' field.
+
+#### Step 3: Select the field
+
+After selecting the Documnet Type, all the fields in that document are listed in 'Field'. Choose the field which you would like to update.
+
+You can choose 'customer_group'.
+
+#### Step 4: Provide the new value
+
+Type the new value in 'Update Value' field.
+
+Type Retail in Update Value field.
+
+#### Step 5: Add Condition if required
+
+You can add the condition here. If the existing records satisfy this condition, only then the values are overwritten.
+
+Conditions should be entered in SQL format.
+
+* You can use a **EQUAL** condition: customer_group = 'Commercial' in Condition field.
+
+* You can use **LIKE** condition: customer_group LIKE 'Commercial'
+
+* You can use multiple conditions with **AND**: customer_group = 'Commercial' AND territory = 'Karnataka'
+
+* You can use **OR** conditions: customer_group = 'Commercial' OR customer_group = 'Individual'
+
+* You can use **NOT** condition: NOT customer_group = 'Commercial'
+
+Enter customer_group = 'Commercial' in condition field.
+
+
+#### Step 6: Add a Limit
+
+There maybe thousands of record which meet the condition. It is better to update maximum 500 records at a time.
+
+Enter 10 in Limit field.
+
+#### Step 7: Click on 'Update'
+
+Finally click on Update button and check the records to make sure values are updated.
+
+You can also watch a [Video Tutorial on Bulk Update Tool](http://erpnext:8000/docs/user/videos/learn/bulk-update.md).
+
+> Be cautious while using the Bulk Update Tool as data is overwritten. Use Limit feature and update values in batches.
+
+{next}
+
+
+<!-- markdown -->

foundation/www/docs/user/manual/en/using-erpnext/articles/index.md

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 # Articles
 
 {index}
+
+{next}
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+<!-- markdown -->

foundation/www/docs/user/manual/en/using-erpnext/articles/index.txt

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 letter-head-in-the-report
 global-search
 copy-pasting-multiple-records-from-excel
+bulk-update