H4 dependents first time stamping and H1B transfer of primary applicant at same time

[MDreamer]

Employee X is currently in USA, working for employer A on H1B & got offer from employer B. Employer B has filed H1B transfer. X will strictly join employer B only after H1B transfer is approved. Family members of X are still in home country, never had any stampings in past. X also wants to apply for dependents H4 stamping using petition/I-797 received via Employer A.
1. Is it OK to only use Employer A documents/I-797 for dependents first time H4 stamping as X is still working for Employer A.
2. Will H4 stamping application have any adverse impact on H1B transfer application?
3. Will H1B transfer have any adverse impact of H4 stamping application?