STAAD CONNECT to Tekla 2017i

So I have tried interoperation between Tekla Structures and STAAD Connect thru ISM.

It works well for the update of geometry & structural members. However, our workflow is as below:

1. Modelling of structural members in TS

2a. Export TS model to STAAD for analysis & design.

2b. Simultaneous with above step, TS is updated for non-structural members such as joists for drawing preparation.

3. Import of STAAD design back to TS.

In the last step, however, the modelled joists are also deleted.

Is there a way for the non-structural members to not get affected by the ISM repository update?

Thanks!