Data_blocks_dangling

hi, i m new in oracle form development, i m doing my first comercial project. i found during practice that a particular data block when once used in any canvas cant be reused in another canvas in the same form, i just replicated that data block with a new names and used it again on different canvases while designing searchig criterias'. can any1 tel me whether this was the right aproach or i just screwed up????
secondly i observed that a certain detail data block can make join relation with only one of such master data blocks. to avoide this delima i again replicated the master data block with changed block name, and achieved my goal. please give me sincere advice if it was the right aproach of a novice programmar or just absurd????

actually i have designd a search mechanism. end user enters a donor registration number, name, nic # or passport number, a small canvas apears in its response showing relative search (5 records at a time). where ever cursor stands. some other dynamic canvases (donor profile, donor tests, his blood tracking etc) are shown on pressing buttons. so there are alots of joins to accomplish this.
i encounterd 2 problems. i had to show certain items of a block on different canvases in different arrangements. which were dangling. so i had to duplicate the whole data block to show some or all of its items in each canvas (ur suggestion of duplicating data items only and then synchronize option didnt work either, i had to duplicate the whole data block).
it was okay till that. but to my extreeme dissapointment, the data item (dn_regno) which had to be used in join conditoin gave me another serious problem. the detail blocks' (dn_regno) could only be joint to only 1 master blocks' (dn_regno). it does not give the desired output when joint with both master blocks, as i have conteneously saying u in my previous posts.
i think u r trying to advise me to replicate dn regno in each block and then join them, i tried this too. what i wil do in embaracement is that to duplicate the block again and make another canvas too... i got sick of it.
thanx for tolerating me dude...

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