open file: controllers/admin/AdminProductsController.php
you've got there $this->field_list definition:
$this->fields_list = array();
$this->fields_list['id_product'] = array(
'title' => $this->l('ID'),
'align' => 'center',
'type' => 'int',
'width' => 40
);
$this->fields_list['image'] = array(
'title' => $this->l('Photo'),
'align' => 'center',
'image' => 'p',
'width' => 70,
'orderby' => false,
'filter' => false,
'search' => false
);
$this->fields_list['name'] = array(
'title' => $this->l('Name'),
'filter_key' => 'b!name'
);
$this->fields_list['reference'] = array(
'title' => $this->l('Reference'),
'align' => 'left',
'width' => 80
);
if (Shop::isFeatureActive() && Shop::getContext() != Shop::CONTEXT_SHOP)
$this->fields_list['shopname'] = array(
'title' => $this->l('Default shop:'),
'width' => 230,
'filter_key' => 'shop!name',
);
else
$this->fields_list['name_category'] = array(
'title' => $this->l('Category'),
'width' => 'auto',
'filter_key' => 'cl!name',
);
$this->fields_list['price'] = array(
'title' => $this->l('Base price'),
'width' => 90,
'type' => 'price',
'align' => 'right',
'filter_key' => 'a!price'
);
$this->fields_list['price_final'] = array(
'title' => $this->l('Final price'),
'width' => 90,
'type' => 'price',
'align' => 'right',
'havingFilter' => true,
'orderby' => false
);
if (Configuration::get('PS_STOCK_MANAGEMENT'))
$this->fields_list['sav_quantity'] = array(
'title' => $this->l('Quantity'),
'width' => 90,
'type' => 'int',
'align' => 'right',
'filter_key' => 'sav!quantity',
'orderby' => true,
'hint' => $this->l('This is the quantity available in the current shop/group.'),
);
$this->fields_list['active'] = array(
'title' => $this->l('Status'),
'width' => 70,
'active' => 'status',
'filter_key' => $alias.'!active',
'align' => 'center',
'type' => 'bool',
'orderby' => false
);
if ($join_category && (int)$this->id_current_category)
$this->fields_list['position'] = array(
'title' => $this->l('Position'),
'width' => 70,
'filter_key' => 'cp!position',
'align' => 'center',
'position' => 'position'
);
you can edit it, just remove / add new fields. everything depends on you
best regarads