4. Edit file "provider/extra_fields.php":
after this lines:
PHP Code:
#
# Use this condition when single mode is disabled
#
$provider_condition = ($single_mode ? "" : "AND provider='$login'");
Insert the following line:
PHP Code:
if ($login!="provider") func_header_location("home.php");
PS. .......$login!="
provider"....
If the username "provider who can edit "Extra Fileds" no "provider", change this condition (Replace the "
provider" for your provider login).
5. Edit file "skin1/provider/menu.tpl":
find this lines:
PHP Code:
{if $active_modules.Extra_Fields ne ""}
<a href="{$catalogs.provider}/extra_fields.php" class="VertMenuItems">{$lng.lbl_extra_fields}</a><br />
{/if}
and replace them with this:
PHP Code:
{if $active_modules.Extra_Fields ne "" and $login eq "provider"}
<a href="{$catalogs.provider}/extra_fields.php" class="VertMenuItems">{$lng.lbl_extra_fields}</a><br />
{/if}
PS. .......and $login eq "
provider"....
If the username "provider who can edit "Extra Fileds" no "provider", change this condition (Replace the "
provider" for your provider login).
If you have any difficulty or questions, I am here. 
Total:
- We allowed only one provider to work with "Extra-fileds".
- All providers see the same set of "Extra-fileds" when working with the product.