Sound like you are following/referencing "create the base tree strucutre for policy store data" mentioned at:
Configure a CA Directory Policy Store - CA Single Sign-On - 12.52 SP2 - CA Technologies Documentation
where a reference to JXplorer is made to create the DIT.
If yes, here is what you can do with dxmodify.
Create a LDIF file with following content: (assuming your DSA prefix is <c US><o psdsa>)
dn: ou=Netegrity,o=psdsa,c=US
objectClass: organizationalUnit
ou: Netegrity
dn: ou=SiteMinder,ou=Netegrity,o=psdsa,c=US
objectClass: organizationalUnit
ou: SiteMinder
dn: ou=PolicySvr4,ou=SiteMinder,ou=Netegrity,o=psdsa,c=US
objectClass: organizationalUnit
ou: PolicySvr4
dn: ou=XPS,ou=PolicySvr4,ou=SiteMinder,ou=Netegrity,o=psdsa,c=US
objectClass: organizationalUnit
ou: XPS
Once done, while the Policy Store DSA is online, you can run the following (in add mode) from the system prompt:
dxmodify -a -h {hostname}:{port} -f filename.ldif
The above will create the required base structure for you. You will still need some sort of LDAP browser though to see and confirm the DIT being there.