1.how can I change the id in the invoice list under invoice tab.(i.e 2001,2002,......)
i answered it in your another post..
2. how to del the colume in the end, aging, owning.
go to--->simpleinvoices/modules/invoices/manage.js...
remove or hide these lines
{display: '{/literal}aging{literal}', name : 'aging, width : 10 * percentage_width, sortable : true, align: 'left'},
{display: '{/literal}owing{literal}', name : 'owing', width : 12 * percentage_width, sortable : true, align: 'left'}
hopes this help