How does sharepoint designer create list item work ?.

Question

I'am using office 365, and sharepoint-designer (not the pro designer).
There is a workflow rule that allows for creating items in another list.
What i need to do is that if someone creates an entry in List A
That List B gets an update too, based upon List A, and also a 4th list entry of list C (ea string containing "life cycle start").
The workflow with the "rule create item in list", i've set to "start automatically when a new item is created".
So far i've not been able to make it work, and the workflow Always suspends with vague errors, and since it is hosted i cannt do much with the errors.
Could therefore anyone point me to a good youtube explaining this  function.
Or might possible point out what often goes wrong when people use this.
Maybe give some examples

Answer 1

Yeeha !!!
I got the first part working now; recap of howto:
First of all, before you create lists and columns write it down on paper, so you will be sure about what names you will give them, as renaming these kinds of things later,  will only rename their view but not their old internal name, and as a result you
will get lost if you want to automate stuff later on.
So have you design ready (or in my case; delete current wrong site and start over clean).
Recap :
Using SharePoint designer:
Create List A, use titles as the field to enter product names (or whatever item you like to registrate).
Use the web browser:
Goto List A you just made and set the title column to contain (required) unique index names.
You can do this as Admin through list setting in the list top ribbon.
Create List B using Sharepoint designer (simple list)
In List B create a Lookup list to List A
And select it so that you would like to see the title column in it.
Using the web brouwser, make this column a required field (will become a (*) mark later).
Using SharePoint designer, select list A.
Select properties of List A, create a new (basic) workflow for it.
Here you would assume that you need to get the title in List B, but that's wrong
What one needs to get in List B a new to the current added Item in List A is the following:
Note that the workflow will run under the context of new Items who are added to List A
Create an action rule "Create list item" in the following list, and here select List B
The pop will show you some fields marked with a (*) as required fields.
Now the tricky thing is that is a reference to List A, and not a string.
So you might think its a GUID then or so, but no wrong again.
To get the link to the current List item A inside B.
You will have to link it to  "Current Item"   (remember the workflow started from list A )
And from the Current Item, you have to select the "ID" property.
Apparently ID is internally used as a reference.
Now whenever you create an Item in list A, it will be created in List B as well as a linked reference.
So for example in A you could add more columns, like serial ID or creation time of article A.
Then you don't have to add these into List B, as when people click on the hyperlink in List B they will be shown the details from list A.