Let’s start 
Everything what you need is:
vRP
Step 1.
Open vrp/modules/basic_garage.lua
To the bottom of file add this:
local veh_doors = {}
and
veh_doors["Open all doors"] = {function(user_id,player,vtype,name)
vRPclient.vc_openDoor(player, {vtype,5})
vRPclient.vc_openDoor(player, {vtype,4})
vRPclient.vc_openDoor(player, {vtype,3})
vRPclient.vc_openDoor(player, {vtype,2})
vRPclient.vc_openDoor(player, {vtype,1})
vRPclient.vc_openDoor(player, {vtype,0})
end, "All doors are open, including hood and trunk"}
veh_doors["Close all doors"] = {function(user_id,player,vtype,name)
vRPclient.vc_closeDoor(player, {vtype,5})
vRPclient.vc_closeDoor(player, {vtype,4})
vRPclient.vc_closeDoor(player, {vtype,3})
vRPclient.vc_closeDoor(player, {vtype,2})
vRPclient.vc_closeDoor(player, {vtype,1})
vRPclient.vc_closeDoor(player, {vtype,0})
end, "All doors are closed, including the hood and trunk"}
Now you can open and close all vehicle doors, but how open single door?
Look at this:
veh_doors["Open hood"] = {function(user_id,player,vtype,name)
vRPclient.vc_openDoor(player, {vtype,4})
end, "Only the hood opens"}
veh_doors["Close hood"] = {function(user_id,player,vtype,name)
vRPclient.vc_closeDoor(player, {vtype,4})
end, "Only the hood closes"}
Now you now how to control single door.
This is the numbering of doors:
0 - Front left
1 - Front right
2 - Rear left
3 - Rear right
4 - Hood
5 - Trunk
Step 2.
Now you need to make a button in the menu.
Add local function
local function ch_vehdoors(player,choice)
local user_id = vRP.getUserId(player)
if user_id ~= nil then
-- check vehicle
vRPclient.getNearestOwnedVehicle(player,{7},function(ok,vtype,name)
if ok then
-- build vehicle menu
local menu = {name="Vehicle: Doors", css={top="75px",header_color="rgba(255,125,0,0.75)"}}
for k,v in pairs(veh_doors) do
menu[k] = {function(player,choice) v[1](user_id,player,vtype,name) end, v[2]}
end
vRP.openMenu(player,menu)
else
vRPclient.notify(player,{lang.vehicle.no_owned_near()})
end
end)
end
end
Step 3.
After you adding local function, add choices in a Menu Builder.
choices["Vehicle: Doors"] = {ch_vehdoors}
You should get something like this:
vRP.registerMenuBuilder("main", function(add, data)
local user_id = vRP.getUserId(data.player)
if user_id ~= nil then
local choices = {}
choices[lang.vehicle.title()] = {ch_vehicle}
choices["Vehicle: Doors"] = {ch_vehdoors}
choices[lang.vehicle.asktrunk.title()] = {ch_asktrunk}
add(choices)
end
end)
That’s all! Easily, right?
I hope this is useful to someone.
Many thanks to ImagicTheCat and other vRP developers!
Check my other tutorial:
[How-to] vRP teleport with GUI (Example)