The figure below shows two forces defined in different coordinates
system and different directions called DRESP_1 and DRESP_2.

The displacements can be combined to a DRESP which can be applied in the optimization like the following:
DRESP
ID_NAME = .....
DEF_TYPE = OPER
VAR_OPER = COMBINE
VARIABLE = ....., .....
VARIABLE = DRESP_1, 0.6
VARIABLE = DRESP_2, -0.8
VARIABLE = ....., .....
....................
END_
Notes:
- Internal forces and reaction forces can be combined and weighted.
- Different directions of internal forces and reaction forces can be combined
and weighted.
- Internal forces and reaction forces of different coordinate systems can be
combined and weighted.
- Reaction force moments and internal force moments can also be combined
and weighted.
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