excitation by acceleration Freq resp(modal)
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Use SPCD card instead of DAREA.Whenever load is in the form of acceleration ,velocity and displacement ,we have to use SPCD card.
Download free eBook on Dynamic analysis using OptiStruct.
https://altairuniversity.com/free-ebook-learn-dynamic-analysis-with-altair-optistruct/
In chapter 14 ,example 14.2 and 14.3 we have applied load as acceleration.


How should I do about inputting unit?
your units are quite right.
But I use the unit (ton, mm, MPa) in the model.
So Should I input 343000 mm/s/s


Can I check the value of SPCD after setting or reopening file?
Yes, Either you can check the same by opening the fem file in any text pad or review from constraint panel.

Please download free eBook on Dynamic analysis using OptiStruct.You will find relevant tutorial and examples.
https://altairuniversity.com/free-ebook-learn-dynamic-analysis-with-altair-optistruct/

14.0 is very old version and upgrading to new version would help you to use new features of OptiStruct.
I have another question, I want to add 35G (343 m/s/s).
But I use the unit (ton, mm, MPa) in the model.
So Should I input 343000 mm/s/s ?