Copy of the transport request!!!

Question

Hi All,
I have development server with clients 100 , 200, 220 , 300.
100 --> SANDBOX
200 --> ABAP Development
220 --> Testing Client
300 --> Customizing / Config ( Golden Client)
1)Is it possible to copy a transport request from 300 to 220?? Will there be any problem as 220 is lower number than 300??
2)IHow transport request can be copied from one client to another within a server??
3)I have 3 system landscape but is it possible to transport from 300(Dev) to Production??Is it recomended??
4)After creation a client I have schedule default jobs from sm36.Is it neccessary to schedule the following jobs:
Job Name ¦ Program
SAP_REORG_JOBS     ¦ RSBTCDEL
SAP_REORG_SPOOL ¦ RSPO0041
SAP_REORG_BATCHINPUT ¦ RSBDCREO
SAP_REORG_ABAPDUMPS ¦ RSSNAPDL
SAP_REORG_JOBSTATISTIC ¦ RSBPSTDE
SAP_REORG_UPDATERECORDS ¦ RSM13002
SAP_COLLECTOR_FOR_JOBSTATISTIC ¦ RSBPCOLL
SAP_COLLECTOR_FOR_PERFMONITOR ¦     RSCOLL00
Regards,
Souren SHarma

Answer 1

User Group for Authorization Check
If you assign a user to a user group for the authorization check on the Logon Data tab, you can distribute user maintenance tasks among several user administrators. The system administrator can assign the respective user administrator the right to create and change users in a group. Using the authorization object User Master Maintenance:User Groups ( S_USER_GRP), you can assign user groups to different administrators.
Users that are not assigned to any of the groups, can be maintained by all administrators.
General User Groups
You use the division of users into user groups on the Groups tab primarily to group users for mass maintenance (transaction SU10). Furthermore, the Global User Manager (transaction SUUM) uses the user groups.
In the user maintenance transaction (SU01), you can assign users to one or more groups on the Groups tab.
Maintaining User Groups
You create user groups using the function Environment -> User Groups -> Maintain. If you are using Central User Administration, you must create the user groups required in all systems.
Use
If you assign a user to a user group for the authorization check on the Logon Data tab, you can distribute user maintenance tasks among several user administrators. The system administrator can assign the respective user administrator the right to create and change users in a group. Using the authorization object User Master Maintenance:User Groups ( S_USER_GRP), you can assign user groups to different administrators.
Users that are not assigned to any of the groups can be maintained by all administrators.
You create user groups using the function Environment -> User Groups -> Maintain. If you are using Central User Administration, you must create the user groups required in all systems.