As per my understanding u are trying to create multiple accounts for a single user in IM on a single resource in that case
if you trying to create through default create user form then u need to make small code change in User Library Form
<Field>
<Comments>Remove the Disable property or set the value to 0 to display the multi-accounts per user fields. </Comments>
<Disable>
<i>0</i> //default is 1 make it o
</Disable>
<FieldRef name='ViewAccountLinkFields'>
<Comments> Fields to support creating or linking more than one account per resource. </Comments>
</FieldRef>
</Field>
once u mke this change u will be able 2 make multiple accounts on a single resource. This is in idm 6.0 . In the lower version i thk u need to enable a field called missing in Tabbed User Form.
I do this by creating a second resource definition the same resource, and then add both resourc definitions to the user role. There will undoubtedly be differences in how the two accounts are created and this allows you to manage each account format indepently. The only pain of this approach is that you have to manage the information about the resource (host name, user-id, password) in two places.