User control categories and product

hi developer,

under the user group is only allow to control major access and modification. How to modify it more comprehensive
example :

user A - only allow access and modify his own categories and product. other than that will not show or not allow to modification
user B - only allow access and modify his own categories and product. other than that will not show or not allow to modification
Administration - allow to access and modify user A and user B categories and product
multiple user control

this is beneficial to USER/VENDOR/SUPPLIES to managed their own product and categories hence monitor by administrator for checking purpose.

i'm using version 1.5.1.3 does any one can give solution and code, how to modification in control base?
appreciate your advice

Please check the Extension store for Multi Vendor extension or similar.

What you require is quite a huge modification and is beyond the scope of General Support

thank you simon.
i found it in extension. testing on their demo see is it the one i looking at.
do you provide those extension as well?

not personally, no