if you want to customize any dash board or create a new dashboard of existing module , just inhertis the view of that module you just only needed the xml file itself. i will given you an example... of what i did intomrp

<openerp>

<data>

<record id="view_work_order_graph" model="ir.ui.view">

<field name="name">mrp.production.workcenter.line.graph</field>

<field name="model">mrp.production.workcenter.line</field>

<field name="arch" type="xml">

<graph string="Manufacturing Analysis" type="pivot" stacked="True">

<field name="name"/>

<field name="production_id"/>

</graph>

</field>

</record>

<record id="filter_by_state_workcenter_id" model="ir.filters">

<field name="name"> By Work Center </field>

<field name="model_id">mrp.production.workcenter.line</field>

<field name="user_id" eval="False"/>

<field name="context">{'group_by':['workcenter_id']}</field>

</record>

<record id="filter_by_state_work_order" model="ir.filters">

<field name="name"> By WorkOrder State </field>

<field name="model_id">mrp.production.workcenter.line</field>

<field name="user_id" eval="False"/>

<field name="context">{'group_by':['state']}</field>

</record>

<record id="filter_by_scheduled_date_work_order" model="ir.filters">

<field name="name"> By Scheduled Date </field>

<field name="model_id">mrp.production.workcenter.line</field>

<field name="user_id" eval="False"/>

<field name="context">{'group_by':['date_planned']}</field>

</record>

<record id="action_work_order_report_all" model="ir.actions.act_window">

<field name="name">Work Order Analysis</field>

<field name="res_model">mrp.production.workcenter.line</field>

<field name="view_type">form</field>

<field name="view_mode">graph,tree</field>

<!-- <field name="search_view_id" ref="view_order_product_search"/>-->

<field name="view_id" ref="view_work_order_graph"/>

<!-- <field name="context">{'search_default_Sales':1, 'group_by_no_leaf':1,'group_by':[]}</field>-->

<field name="help">This report performs analysis on your quotations and sales orders. Analysis check your sales revenues and sort it by different group criteria (salesman, partner, product, etc.) Use this report to perform analysis on sales not having invoiced yet. If you want to analyse your turnover, you should use the Invoice Analysis report in the Accounting application.</field>

</record>

<menuitem action="action_work_order_report_all" id="work_order_analysis" parent="manufacture_parent_report_menu" sequence="4"/>

</data>

</openerp>