GiD_AssignData material|condition <name> <over> ?<values>? <entities>
To assign materials or conditions over entities:

<name> is the name of the material or condition. In case of material it is allowed a numeric index (0 for not assigned material)
<over> must be: points, lines, surfaces, volumes, layers, groups, nodes, elements, body_elements, or face_elements (elements is equivalent to body_elements). Layers and groups is valid for conditions defined over them, but not for materials.
<values> is only required for conditions. If it is set to "" then the default values are used;
<entities> a list of entities (it is valid to use ranges as a:b ,can use "all" to select everything, "end" to specify the last entity, layer:<layername> to select the entities in this layer) ; if <over> is face_elements then you must specify a list of "entity numface" instead just "entity". (numface starting from 1)

Example:

GiD_AssignData material Steel Surfaces {2:end} 
GiD_AssignData condition Point-Load Nodes {3.5 2.1 8.0} all
GiD_AssignData condition Face-Load face_elements {3.5 2.1 8.0} {15 1 18 1 20 2}

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