Newbie Question, how can I reuse a resource in Resource Groups

[beni]

Hello,

I am newbei, please bare with me.

I have following setups. In the resource files, there are resource definition for each person in the project. However I can not create groups. I receive errors in group definitions. I am being asked to enter string after id, when I entered it, I am told that resource is already defined as expected. How can

include "resources/resource_1.tji"
include "resources/resource_2.tji"
include "resources/resource_3.tji"
include "resources/resource_4.tji"
include "resources/resource_5.tji"

resource groupa  "Group A" {
  resource resourceid1
  resource resourceid2

}

resource groupb "Group B" {
  managers resourceid1
  resource resourceid2
  resource resourceid3
  resource resourceid4
  resource resourceid5
}


resource groupc  "Group C " {
  resource resourceid2
  resource resourceid3
}