Issues with Adding new items in UDB.

[Hellsmith2]

I need some help with ultimate doom builder can someone show me how to addon new items or custom items?

The format that I'm using is zandronum: doom 2 (hexen)

Script type zandronum acs.

I tried using Doomednum, and read through zdoom.wiki and I followed the instructions but still nothing.

[Kappes Buur]

In the case of new actors like monsters, weapons, decorations, etc. you will find that Ultimate Doom Builder is useful only after the actors have been created with either Slade3 or a text editor like Notepad++. Once the actor has been created then UDB is useful in populating a map with such actors.

Actors are created with either DECORATE or ZSCRIPT, when using Zandro I guess DECORATE.

So, how to start: read https://zdoom.org/wiki/DECORATE and select the appropriate topic.
There are many examples on the Realm667 repository

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As an example the CrackoDemonl:

Download the actor and unzip it
Create a map and save it.

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Open the map and the actor in Slade3

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as you can see the actor already has a doomed number
Editor numbers must be unique, to see which number is already
allocated and which is free see this table.

transfer (copy/paste) all lumps of the actor to the end of your map

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and save

Now open your map in UDB and populate your map with the new actor
you find it in the DECORATE category

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check in 3D view

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save the map

and play in Zandro

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[Hellsmith2]

I read all the steps that you provided for me but unfortunately when I opened up my map in ultimate doom builder in the zandronum format the custom items or monsters did not show up.

Is there another way to approach this?

[Kappes Buur]

the custom items or monsters did not show up.

You mention actors, plural.
As I touched on in my post, actors need to have a unique doom editor number, which is supplied in the DECORATE definition.

ACTOR CrackoDemon 5123

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Without that number UDB cannot see the actor.

Maybe you could provide a link to your map